The Best Period Underwear in Australia for 2026
Our pickAuntFlo Boyfriend Briefs 2.0★ 4.1 (620) · Buy 3 get 2 freeShop →The best period underwear in Australia for most people is the AuntFlo Boyfriend Briefs 2.0: AuntFlo rates them at 50 ml, about 8 to 10 tampons, with a gusset that runs from the front all the way to the back, and on the buy 3 get 2 free bundle they cost $27 a pair. They hold 4.1 stars from 620 reviews on AuntFlo's site. We compared seven pairs from AuntFlo, Modibodi, Bonds, Love Luna, Thinx and Boody on published capacity, fabric, gusset coverage, sizing and washing.
In this guide
- Which period underwear should you buy in Australia right now?
- What is the top rated period underwear in Australia?
- How did Best Period Undies choose these period undies?
- Best overall: AuntFlo Boyfriend Briefs 2.0 for heavy days and overnight
- Modibodi review: is Modibodi period underwear still worth it in Australia?
- Are Bonds period undies a good first pair of period underwear?
- Is the AuntFlo Seamless Period G-String a good pair for light days and fitted clothes?
- Is Love Luna period underwear worth buying to build a rotation?
- Is Thinx period underwear worth ordering from the US?
- Is Boody period underwear the right pick for bamboo comfort?
- What should you look for in period underwear?
- Is there plus size period underwear in Australia?
- How do you choose period underwear for your flow?
- How do you wash period underwear so it actually lasts?
- What else will you want alongside your period undies?
- Which brands sell period underwear in Australia?
- What about period swimwear?
- What did we look at and leave out?
- Period undies review: questions Australian buyers actually ask
- What else should you sort out while you are here?
- About the author
Compare at a glance
AuntFlo Boyfriend Briefs 2.0 50 ml
Heavier days and overnight, 50 ml published
Modibodi Sensual Hi-Waist Bikini Super
The best-known name in Australian period undies
AuntFlo Seamless Period G-String 7.5 ml
Seamless, for spotting and fitted clothes
Prices and ratings checked 22 October 2026 on each brand's site and ProductReview.com.au, and subject to change.
Two brands sell a period brief that states 50 ml, and one of them costs about $13 a pair less than the other's full price once you buy five. Modibodi says its Super absorbency holds up to 10 tampons. AuntFlo says its Boyfriend Briefs 2.0 hold 50 ml, about 8 to 10 tampons. Same capacity on the label, but the gusset on the AuntFlo pair runs from the front all the way to the back. If you have ever bought period undies that gave up halfway down your back overnight, that difference is probably why.
This guide is about picking the right product, not about managing your health. We report absorbency exactly as each brand states it on its own product page, because no shared Australian standard forces brands to measure the same way. If your flow is changing, unusually heavy, or worrying you, that is a conversation for a GP or Healthdirect, not a shopping page. What we can do is tell you what each listing claims and where the sizing and capacity complaints sit. All seven picks are reusable, which is the whole point of the category: you buy a rotation once and wash it, rather than buying pads or tampons every month.
Period underwear is reusable underwear with a built in absorbent layer that you wash and wear again, instead of a pad or tampon. Absorbency is the stated capacity in millilitres, or the brand's tampon equivalent, and brands set their own conversion: AuntFlo and Modibodi both count a tampon as 5 ml, while Bonds only publishes tampons' worth. OEKO-TEX Standard 100 is a textile testing standard for harmful substances, not a health claim.
Which period underwear should you buy in Australia right now?
For most people the AuntFlo Boyfriend Briefs 2.0 are the ones to buy. AuntFlo rates them at up to 50 ml, about 8 to 10 tampons, in a boy leg brief with a 95 percent cotton body and lining, a four-layer core and an extended gusset that runs front to back, and it holds 4.1 stars from 620 reviews on AuntFlo's site. The AuntFlo Seamless Period G-String covers the lighter end of the cycle. If you only buy one style, buy the Boyfriend Briefs for your heaviest two days and nights.
For a second opinion, the Modibodi Sensual Hi-Waist Bikini Super states the same 50 ml and is the most reviewed pick here, at 3.9 from 998 reviews on ProductReview.com.au. If price decides it, AuntFlo's buy 2 get 1 free and buy 3 get 2 free bundles bring the Boyfriend Briefs down to $30 and $27 a pair. Buy two pairs before you buy six: fit is personal, and a pair that rides up on you can sit perfectly on someone else in the same dress size.
What is the top rated period underwear in Australia?
Our pick is the AuntFlo Boyfriend Briefs 2.0, rated 4.1 from 620 reviews, because AuntFlo rates them at up to 50 ml with front to back gusset coverage. The AuntFlo Seamless Period G-String carries the highest score here, 4.6 from 323 reviews, but holds 7.5 ml, so it suits lighter days.
Ratings are customer ratings, not our own test, and they come from different places: AuntFlo and Boody show reviews on their own sites, while the Modibodi and Bonds scores come from ProductReview.com.au, an independent review platform. The other picks follow in order: Boody at 4.6 from 39, Modibodi at 3.9 from 998, and Bonds at 1.6 from 35, most of them written before Bonds lengthened its gusset. Love Luna shows 2,238 reviews on its site without a clear average, and Thinx has no Australian rating we could verify. Rating alone does not decide the pick, so match the stated capacity to your flow.
Which pair suits which situation:
- Heavier days and overnight: the AuntFlo Boyfriend Briefs 2.0, which state up to 50 ml.
- Heavy days from the best-known brand: the Modibodi Sensual Hi-Waist Bikini Super, which states up to 50 ml.
- A budget first pair: the Bonds Bloody Comfy Period Full Brief Heavy.
- Light days and fitted clothes: the AuntFlo Seamless Period G-String.
- Building a cheap rotation: the Love Luna Period Full Brief at $15.
- A long trial from a US brand: the Thinx Comfort Stretch Hiphugger, with a 45-day trial.
- Bamboo softness: the Boody Period & Leak Proof Undershorts 3" Moderate.
How did Best Period Undies choose these period undies?
Best Period Undies does not run a laundry lab and will not pretend otherwise. To find the best period undies Australia has right now, we read each brand's own product page, including its absorbency panel, fabric table and care notes, and we report capacity exactly as the maker words it. Every pick was listed on 22 October 2026 and carries a star rating or review base we were willing to quote.
We left out products with only a handful of reviews, because a rating from three people is noise. Bonds stayed in at 1.6 stars, because it is the brand most Australians can pick up at the supermarket and an honest verdict beats leaving it out. The details we quote are for the specific style we name, and a different absorbency in the same range can differ.
How do the seven picks compare on absorbency and rating?
Absorbency is the spec that decides how a pair performs, and brands describe it inconsistently. The table shows every pick with its capacity worded as its listing words it, whether it is reusable, the rating with the review count in brackets and where it comes from, and the outer fabric. Where no millilitre figure exists, we say so rather than guess.
| Pick | Claimed absorbency | Reusable | Rating (count) | Outer fabric |
|---|---|---|---|---|
| AuntFlo Boyfriend Briefs 2.0 (our pick) | 50 ml, up to 8 to 10 tampons | Yes | 4.1 (620), AuntFlo site | 95% cotton, 5% spandex |
| Modibodi Sensual Hi-Waist Bikini Super | 50 ml, up to 10 tampons | Yes | 3.9 (998), ProductReview | Not stated on the page we read |
| Bonds Bloody Comfy Period Full Brief Heavy | Up to 4 tampons' worth, no ml figure | Yes | 1.6 (35), ProductReview | Cotton and elastane |
| AuntFlo Seamless Period G-String | 7.5 ml, about 1.5 tampons | Yes | 4.6 (323), AuntFlo site | 78% nylon, 22% spandex |
| Love Luna Period Full Brief | 15 to 20 ml, about 3 to 4 tampons | Yes | 2,238 reviews, no average shown | Not stated on the page we read |
| Thinx Comfort Stretch Hiphugger | No millilitre figure, “up to 12 hours” | Yes | No AU rating verified | Not stated on the page we read |
| Boody Undershorts 3" Moderate | 15 ml, up to 3 tampons | Yes | 4.6 (39), Boody site | Bamboo blend, per the brand |
Read the table sideways and a pattern shows. Only two picks state 50 ml: AuntFlo's Boyfriend Briefs and Modibodi's Super. Bonds states tampon equivalents instead, and Thinx gives no capacity number. That is not a reason to avoid them, only a reason to buy one pair first.
Last checked: 22 October 2026
Best overall: AuntFlo Boyfriend Briefs 2.0 for heavy days and overnight
Choose the AuntFlo Boyfriend Briefs 2.0 for heavy days and overnight: it is our best overall pick, rated 4.1 from 620 reviews on AuntFlo's site. AuntFlo rates it at up to 50 ml, about 8 to 10 tampons, with a four-layer core and an extended gusset that runs from the front to the back. Only the Modibodi Super also states 50 ml.
AuntFlo
AuntFlo Boyfriend Briefs 2.0
Our best overall pick if you want one style built for heavier days and overnight wear. It holds up to 50 ml, about 8 to 10 tampons, matched here only by the Modibodi Super, and the gusset extends from front to back rather than stopping halfway. The body and lining are 95 percent cotton, and the brief comes in XS to 4XL. One reviewer says they feel secure wearing them to bed on their heaviest flow day, and another, recently postpartum, says they have not bled through once. The fit is the caveat: the brand itself says this style runs a little small.
Buy 2 get 1 free · Buy 3 get 2 free
Single pair $44.99, five pairs $134.99 at auntflo.au, as of 22 October 2026.
In stock at auntflo.au, checked 22 October 2026
Shop at AuntFloBuy 2 get 1 free and buy 3 get 2 free apply within the same style.
The construction is what earns the place. The listing describes four layers: a breathable top layer against the skin, an absorbent layer, a waterproof layer, and a soft cotton layer that holds it all together. The fabric table shows a body and lining of 95 percent cotton with 5 percent spandex, and a middle layer of 80 percent polyester and 20 percent nylon. The listing also carries an OEKO-TEX Standard 100 certificate, number 26.HCN.42389, tested by Hohenstein, and states the undies are free from PFAs.
The reviews we could read on the listing back the overnight use. “I feel so secure and comfortable wearing these to bed on my heaviest flow day,” writes Sheree R., a verified buyer, in September 2026. Jemma W., another verified buyer, says they have switched from tampons and adds: “I no longer fear any leaks/overflows at work.” Care is spelled out on the listing: pre-rinse, gentle cold machine wash, hang to dry. The buy 2 get 1 free and buy 3 get 2 free bundles bring the price to $30 and $27 a pair, which matters, because a heavy-day rotation needs more than one pair.
Flaws but not dealbreakers
The fit runs small. AuntFlo's own size guide recommends sizing up, and several reviewers say they went one size up and were glad they did; one moved from L to XL after the waistband felt tight. Another reviewer says the material can roll up the thighs, and that after more than about eight hours on a heavy day it leaked to the sides but never through to their clothes. At up to 50 ml it carries more than a light day needs, so pair it with the G-String below for the start and end of your cycle.
Modibodi review: is Modibodi period underwear still worth it in Australia?
Modibodi is the name most people search first, and the Modibodi Sensual Hi-Waist Bikini Super is a solid heavy-day pick, rated 3.9 from 998 reviews on ProductReview.com.au. Modibodi rates it at up to 50 ml, about 10 tampons based on a 5 ml tampon, and the brand lists OEKO-TEX Standard 100 certification.
Modibodi
Modibodi Sensual Hi-Waist Bikini Super
This is the pair for anyone who wants the category's biggest name. Modibodi period undies come in the widest range here, covering period, teen, swim, sleep and bladder leaks, and the Super absorbency states the same 50 ml as our top pick. The black-coloured lining is designed to stop visible stains, and Modibodi underwear is listed as OEKO-TEX Standard 100 certified. On ProductReview.com.au, 65 percent of reviews are positive, with heavy flow, overnight wear and teen first periods the common reasons to buy. It sits second on value and consistency: at its $39.99 full price it costs about $13 a pair more than AuntFlo's five-pack price, and recent reviews raise durability.
modibodi.com full price as of 22 October 2026, subject to change.
Compare with our #1 pickThis button opens our #1 pick, the AuntFlo Boyfriend Briefs 2.0.
Modibodi Australia publishes capacity the way it should be published: millilitres first, then a tampon equivalent with the conversion stated. The range uses a patented layered gusset, and Modibodi's support pages say its products do not use PFAS. Free standard shipping starts at $75.
The reviews we read on ProductReview.com.au are split. Satisfied buyers describe how much the pair holds and how quickly it wicks, and one says they can finally sleep through the night without checking. Of the negative reviews we read, the largest group was about quality, including one buyer whose replacement pair also developed holes. On Reddit, around 20 commenters across six threads said Modibodi quality has dropped in recent years, though some say their pairs have lasted five years.
Flaws but not dealbreakers
Two things to know before you order. One ProductReview.com.au reviewer says the “Super” rating comes from a gusset that runs higher up the belly rather than extra thickness, so check the cut against how you sleep. Another says a return was refused because the packaging had been opened. Modibodi also runs frequent markdowns, so check the live price before paying the full $39.99.
Are Bonds period undies a good first pair of period underwear?
The Bonds Bloody Comfy Period Full Brief Heavy is the easy first pair to try, because it comes from a brand most Australians already wear. Bonds says the heavy brief absorbs up to 4 tampons' worth through a longer built-in gusset that runs front to back, but it publishes no millilitre figure.
Bonds
Bonds Bloody Comfy Period Full Brief Heavy
A sensible first pair to test the category. Bonds publishes its whole absorbency ladder: ultra light about one tampon, moderate about three, heavy about four, overnight about eight. This is the heavy rung, and knowing that up front is worth more than any star rating, because 4 tampons' worth is well short of a 50 ml brief. The body and gusset lining are cotton and elastane, and Bonds says the gusset was lengthened for more coverage. The fit is snug by design, so size up if you want more room. In the CHOICE trial from 2021, the Bonds heavy brief scored 76, with 91 percent of triallists reporting no leaks.
bonds.com.au RRP range $19.99 to $34.99. Bonds showed 40% off sitewide on 22 October 2026.
Compare with our #1 pickThis button opens our #1 pick, the AuntFlo Boyfriend Briefs 2.0.
Bonds period underwear sells on familiarity and price. The listing promises no leaks, no odours and easy washing, with moisture wicking and odour neutralising technology, in sizes 8 to 24, with free shipping for Bonds Rewards members. It is also the range most people have already seen on a supermarket shelf.
The reviews are the weak point. Bonds scores 1.6 from 35 reviews on ProductReview.com.au, and in the 22 we read, about 15 described leaks, mostly at the front, where the gusset did not come up high enough. Most of those reviews date from 2021 and 2022, before Bonds lengthened the gusset, so the current pair may do better than that score suggests. Reddit users who moved from Modibodi to Bonds on price say the redesign helped.
Flaws but not dealbreakers
Bonds period pants are bulkier than most picks here, and several reviewers describe them as “nappy like” or noisy. Some also mention a scent from the odour treatment that they did not like. At 4 tampons' worth, treat the heavy brief as a day pair, and step up to the overnight style or a 50 ml brief for nights.
Is the AuntFlo Seamless Period G-String a good pair for light days and fitted clothes?
For light days, spotting and anything fitted, the AuntFlo Seamless Period G-String is the pick, rated 4.6 from 323 reviews on AuntFlo's site, the highest score in this guide. AuntFlo puts it at 7.5 ml, about 1.5 tampons, in a seamless cut designed not to show through leggings.
AuntFlo
AuntFlo Seamless Period G-String
The answer to visible lines on light days. It holds 4.6 stars from 323 reviews, the top rating here, and at 7.5 ml, about 1.5 tampons, it is built for spotting, discharge and the first and last days of a cycle rather than heavy flow. The outer is a seamless nylon and spandex knit with a 95 percent cotton inner, and it carries the same four-layer system and OEKO-TEX Standard 100 certificate as the Boyfriend Briefs. Reviewers describe the fabric as buttery soft and say nothing shows under gym tights. Unlike the Boyfriend Briefs, AuntFlo says this style runs true to size, from XS to 4XL.
Buy 2 get 1 free · Buy 3 get 2 free
Single pair $35.99, five pairs $107.99 at auntflo.au, as of 22 October 2026.
In stock at auntflo.au, checked 22 October 2026
Shop at AuntFloBuy 2 get 1 free and buy 3 get 2 free apply within the same style.
The listing describes the same four layers as the heavier styles in a slimmer build: a breathable top layer, an absorbent layer, a waterproof layer and a soft cotton layer. Care is the same too: pre-rinse, gentle cold machine wash and hang to dry. On the buy 3 get 2 free bundle it works out at $21.60 a pair, and colours include red, black, pink and apricot. Most buyers pair it with the Boyfriend Briefs: one for light days, one for heavy.
The reviews we read are mostly about comfort and the gym. “They are also great for the gym as they are seamless so you can continue wearing tights and nothing shows,” writes Samantha Elizabeth G., a verified buyer, in July 2026. Another reviewer uses them as backup with a menstrual disc on the last day or two. A reviewer with a heavy endometriosis flow says they now pair a smaller tampon with these for workouts.
Flaws but not dealbreakers
At 7.5 ml it is a light-day pair, and the brand says so; on heavy days it is a backup, not a replacement. One reviewer wished there was an XXS, as the XS sat slightly loose for a size 6, and another notes they take one and a half to two days to air dry fully, so a rotation needs more than one pair.
Is Love Luna period underwear worth buying to build a rotation?
Love Luna is the cheapest way to build a rotation, with the Love Luna Period Full Brief at $15 a pair and the Super Period Full Brief at $25. Love Luna puts it at 15 to 20 ml, about 3 to 4 regular tampons, for the medium+ full brief, and about 40 ml for the Super.
Love Luna
Love Luna Period Full Brief
The budget rotation pick. At $15, Love Luna period undies cost about a third of a single AuntFlo pair, and the brand is Australian owned. The medium+ full brief states 15 to 20 ml, about 3 to 4 regular tampons, the Super about 40 ml, and Love Luna says its range was independently tested for PFAS (PFOA and PFOS) with no trace detected, without naming the lab. It also states about 50 washes per pair. The site shows 2,238 reviews, and in the 2021 CHOICE trial the Love Luna bamboo brief scored 75 with the highest comfort score. The reservation is capacity: the price per millilitre is closer than the sticker suggests.
loveluna.com.au price as of 22 October 2026, subject to change.
Compare with our #1 pickThis button opens our #1 pick, the AuntFlo Boyfriend Briefs 2.0.
Love Luna period underwear covers more than periods: there is a teen line, maternity, light bladder leakage and swim. Sizes run from 8 to 22 in the core briefs, with a separate Plus Super line, and shipping is free over $100 Australia wide.
The reservations are about capacity and fabric rather than comfort. Love Luna's own FAQ is inconsistent: it lists the Super at about 40 ml but also says its most absorbent brief holds 3 to 4 regular tampons. In the CHOICE trial, 30 percent of triallists reported a leak during the day with Love Luna briefs, and some reviewers describe the cotton as thin.
Flaws but not dealbreakers
A $15 pair that holds 15 to 20 ml is a light to medium pair. If you need heavy-day protection, five Love Luna Super briefs cost $125 against $134.99 for five AuntFlo Boyfriend Briefs on the 3 + 2 bundle, and state 40 ml rather than 50 ml.
Is Thinx period underwear worth ordering from the US?
Thinx is the brand that started the category, and the Thinx Comfort Stretch Hiphugger is the pick if a long trial matters more to you than local shipping. Thinx promises leakproof protection for up to 12 hours, but publishes no millilitre figure.
Thinx
Thinx Comfort Stretch Hiphugger
The answer for anyone who wants the original brand and the longest trial here. Thinx offers a 45-day trial and sizes up to 4X, and its absorbency tiers are named by use, such as all day or all night, rather than by millilitres. Thinx period undies ship to Australia from the US store, with standard courier delivery taking 6 to 12 business days, and prices of about $40 to $43 a pair appear to be in US dollars. In the 2021 CHOICE trial, the Thinx Super Cotton brief scored 73 and the Hiphugger 69, with no-leak results of 80 and 63 percent, the lowest of the brands tested. The reservation is the missing capacity figure: you cannot compare it to a 50 ml brief.
thinx.com catalogue price as of 22 October 2026, appears to be USD.
Compare with our #1 pickThis button opens our #1 pick, the AuntFlo Boyfriend Briefs 2.0.
Thinx period panties come in one of the widest size ranges here, alongside AuntFlo's XS to 4XL, and the brand's teen kits are a common gift. Thinx says PFAS have never been part of its product design.
Australian reviews are hard to find. The Trustpilot page for the brand's store scores around 1.5 from about 80 reviews, though we could read only snippets, and the complaints there are about leaks soon after putting a pair on. One YouTube commenter says their pairs did not last more than a year. Because most Thinx reviews come from US buyers, treat any rating as low confidence for Australia.
Flaws but not dealbreakers
Shipping is the practical flaw. Ordering from the US means waiting 6 to 12 business days and paying in US dollars, and we could not confirm the free shipping threshold or any duties for Australian orders. Thinx also gives no millilitre figure, so buy one pair and test it on a medium day before building a rotation.
Is Boody period underwear the right pick for bamboo comfort?
For comfort first, the Boody Period & Leak Proof Undershorts 3" Moderate are the softest-feeling pick here, rated 4.6 from 39 reviews on Boody's site. Boody puts it at up to 3 tampons, 3 pads, or 15 ml, in a high-rise undershort.
Boody
Boody Period & Leak Proof Undershorts 3" Moderate
The answer if softness is what you shop for. Boody is a bamboo basics brand, and these undershorts give full, high-rise coverage that the listing pitches for overnight wear. It holds up to 3 tampons or 15 ml, uses a three-layer gusset of cotton, bamboo and cotton, and modal and seaweed fibre, and says the product is certified as 100 percent PFA-free without naming the certifier. Sizes run XS to 4XL. One reviewer calls them by far the most comfortable period pants they own. The reservation is capacity: 15 ml is a moderate day, whatever the overnight pitch says.
boody.com.au price as of 22 October 2026, subject to change.
Compare with our #1 pickThis button opens our #1 pick, the AuntFlo Boyfriend Briefs 2.0.
Boody period undies sit inside a broader basics range, so the fabric will feel familiar if you already wear the brand's everyday underwear. Free standard shipping starts at $60, and free express at $150.
The reviews we read on Boody's site were all three stars or above, and most praise comfort: one reviewer says it is like wearing normal boyleg underwear to bed. The recurring complaint is legs rolling up when walking, raised by four of the 39 reviewers, along with bulk under tight pants.
Flaws but not dealbreakers
The listing contradicts itself: it calls the style moderate and also says it is designed for your lightest period days. At 15 ml and $42 a pair, it costs almost as much as a 50 ml AuntFlo Boyfriend Brief that holds more than three times as much. Some reviewers found the sizing ran large, so check the size chart.
What should you look for in period underwear?
Start with the absorbency claim and check the units. A brand quoting millilitres gives you something comparable, while a label that says heavy tells you little. Bonds counts heavy as 4 tampons' worth and AuntFlo counts heavy as 50 ml, about 8 to 10 tampons, so compare the stated capacity first, then the gusset, the fabric against the skin, the cut and the sizing.
Then check the gusset. How wide the panel is, how far forward it starts and how far up the back it runs all affect where a pair can leak, so look for a listing that describes front to back coverage, as the AuntFlo Boyfriend Briefs and the Bonds heavy brief both do. In Reddit's period underwear threads, coverage all the way up the back is the feature heavy bleeders mention most when they explain why they stay with a brand.
Next, fibre against skin. A cotton lining, like the 95 percent cotton in the AuntFlo Boyfriend Briefs, suits you if synthetics irritate, though check the middle layer: in most period undies, these included, it is polyester or nylon. Bamboo, as in Boody, feels softer and drapes more. A nylon and spandex outer, like the AuntFlo Seamless G-String, suits fitted clothing but is a synthetic against the skin on the outside. There is no universally right answer, only a right answer for the outfit.
Then cut. A full brief or boy leg gives more coverage and more room for a large panel, which is why the two picks here that state 50 ml are a boy leg brief and a high-waist bikini. A g-string is for light days.
Finally, sizing. Fit complaints come up for almost every brand we read, and fit is personal. AuntFlo says its Boyfriend Briefs run a little small and recommends sizing up, Bonds says its fit is snug by design, and some Boody reviewers say theirs ran large. If you are between sizes, take the larger one, and buy one or two pairs first.
Is there plus size period underwear in Australia?
Plus size options depend on the brand. AuntFlo runs XS to 4XL in both the Boyfriend Briefs and the Seamless G-String, and one reviewer who wears a 16 to 18 says the 3XL fits perfectly. Thinx goes up to 4X and Boody to 4XL. Check each chart against your measurements and size up if you are between sizes.
Bonds runs sizes 8 to 24 and says its Bloody Comfy fit is snug, so allow for that. Love Luna's core briefs stop at 20 to 22, with a separate Plus Super line, and the Rudie brief we checked only goes to 14 or XL. We have not checked every style in every range, so read each size chart before you order.
How do you choose period underwear for your flow?
Match absorbency to your flow. Use a light pair at the start and end of a cycle and a heavy or overnight style with a long gusset on heavy days. AuntFlo states 7.5 ml for the Seamless G-String and 50 ml for the Boyfriend Briefs, and Bonds publishes its ladder in tampons' worth, so pick by the stated figure.
- AuntFlo Seamless Period G-String: 7.5 ml, about 1.5 tampons.
- Boody Undershorts 3" Moderate: 15 ml, up to 3 tampons.
- Love Luna Period Full Brief (medium+): 15 to 20 ml, about 3 to 4 tampons.
- Bonds Bloody Comfy heavy: 4 tampons' worth.
- Love Luna Super Period Full Brief: about 40 ml.
- AuntFlo Boyfriend Briefs 2.0 and Modibodi Super: 50 ml, up to 8 to 10 and up to 10 tampons.
Brands set their own conversion, so a Bonds heavy and an AuntFlo heavy are not the same capacity. For overnight use the stated figure matters more than the label.
How do you wash period underwear so it actually lasts?
Rinse in cold water until clear, then machine wash cold on a gentle cycle and hang to dry. The AuntFlo listings say to pre-rinse, gentle cold machine wash and hang to dry, and Modibodi gives similar care instructions.
Machine wash cold on a gentle cycle after rinsing. A mesh laundry bag is worth using, less for the fabric than for the elastic and seams; AuntFlo reviewers mention the wash bag that came with their order.
Skip fabric softener and skip bleach. A layered garment is built to pull moisture through, and a coating from softener works against that.
Line dry, always. A dryer is a risk to the waterproof layer, so skip the tumble dryer. A thick heavy-day brief can take more than a day to line dry in cooler weather, and one AuntFlo reviewer says even the G-String takes one and a half to two days to air dry fully.
Expect some marking over time. Rinsing promptly is the first care step, and black fabric hides marking better than light colours.
What else will you want alongside your period undies?
A rotation beats a single pair, so a second or third style is the natural next buy. The AuntFlo High Waisted Period G-String is a higher-rise g-string in the same range as our two AuntFlo picks, so it is an easy second pair if the brand suits you.
- AuntFlo High Waisted Period G-String, rated 4.6 from 30 reviews on AuntFlo's site.
A heat pack is the other thing worth having in the drawer for the same week. Drying matters as much as washing here: a covered line, a heated airer, or a bigger rotation all beat a tumble dryer, which works against the hang-to-dry care on every listing here.
Which brands sell period underwear in Australia?
AuntFlo, Modibodi, Bonds, Love Luna, Boody and Rudie all sell period underwear from Australian websites, and Thinx ships to Australia from the US. Search period underwear Bonds and you will find the Bloody Comfy range in stores as well as online. Scarlet, Knicked and Fri Period also appear in Australian search results; we have not ranked them here.
If you are comparing the best period underwear Australia offers, the question to ask any brand is the same one this page keeps asking: how many millilitres, and does the brand publish the number at all.
What about period swimwear?
Period underwear and period swimwear are not the same product, and none of the seven picks here is sold as swimwear. We have not ranked swimwear in this guide because it belongs in a swimwear guide rather than an underwear one. AuntFlo, Modibodi and Love Luna all sell separate period swim styles, so check the swim style's own listing for what it covers.
For swimming on a heavy day, the swim style's own capacity figure is what matters, not the brand's underwear figures.
What did we look at and leave out?
Several brands come up in Australian search that we did not rank. Rudie period underwear was on our list: the Rudie Leakproof Period Brief states 10 to 15 ml for moderate days in a bamboo build, runs a buy 2 get 1 free and buy 3 get 2 free offer like AuntFlo's, and shows 4.88 from 24 reviews, only 3 of them verified. The brief was sold out in every size on 22 October 2026, and Rudie period undies only run to size 14 or XL, so we left it out for now.
We also passed on Scarlet, Knicked and Fri Period, which appear in Google results, because we did not check their products closely enough to rank them. That is a real limitation of this guide and we would rather say so.
Bonds rates its Overnight rung at 8 tampons' worth, the highest tampon equivalent Bonds publishes. We have not ranked that style here, because we compared the heavy brief.
Period undies review: questions Australian buyers actually ask
How many pairs of period underwear do you actually need?
Work backwards from drying time, not from your cycle. If a heavy-day brief takes a day and a half to line dry in cooler months and you want two pairs a day on heavy days, you need five or six pairs to avoid washing daily. Start with two or three, see how the laundry maths works for you, then fill the rotation; AuntFlo's buy 3 get 2 free bundle makes five pairs of Boyfriend Briefs $27 each.
Do period undies feel wet during the day?
The AuntFlo listings describe a breathable top layer designed to keep you cool and dry, and the Bonds listing describes moisture wicking technology. How dry a pair feels depends on how close you sit to the stated capacity. One AuntFlo reviewer says the pair feels dry, and that when it starts to feel wet, that is the sign to change. If yours consistently feel saturated, step up an absorbency.
How long does period underwear take to dry on a clothes line?
A full brief with a layered core is slow to dry. The AuntFlo and Modibodi care notes both point to hang or line drying, so plan on a full day or more on an indoor airer in cooler months; one reviewer says even the slim G-String takes one and a half to two days. Own enough pairs that a slow dry never leaves you short.
Should you size up in period underwear?
If you are between sizes, usually yes. AuntFlo says its Boyfriend Briefs run a little small and recommends sizing up, and Bonds says its fit is snug by design. One AuntFlo reviewer who is usually a size 10 to 12 ordered a large, found the waistband tight, and says the XL fit perfectly. Check each size chart.
Is period underwear cheaper than pads and tampons?
It can be, because you wash a reusable pair instead of rebuying a disposable every cycle. The saving depends on how many pairs you need and how long they last. Price per pair is the number to compare: $15 for Love Luna, $27 for AuntFlo Boyfriend Briefs on the 3 + 2 bundle, $39.99 for Modibodi at full price and $42 for Boody.
How many times can you wash period underwear?
Love Luna is the only brand here that states a wash count, at about 50 washes. The others give care rules instead: wash cold, hang to dry and skip fabric softener. Heat, bleach and softener are the habits most likely to shorten a pair's life, so follow the care label.
Does period underwear contain PFAS?
AuntFlo states its period undies are free from PFAs and that PFAs are not part of its product design. Love Luna says its range was independently tested for PFOA and PFOS with no trace detected, Boody says its undershorts are certified 100 percent PFA-free, Modibodi's support pages say it does not use PFAS, and Thinx says PFAS have never been part of its product design. OEKO-TEX Standard 100 is a textile testing standard for harmful substances, and it appears on the AuntFlo and Modibodi listings.
What is the top rated period underwear in Australia?
Our pick is the AuntFlo Boyfriend Briefs 2.0, rated 4.1 from 620 reviews, because its listing states up to 50 ml with front to back gusset coverage. The AuntFlo Seamless Period G-String has the highest rating here, 4.6 from 323 reviews, but holds 7.5 ml, so it suits lighter days.
Can you swim in period underwear?
Not in any of the seven pairs here. None of them is sold as swimwear, so we do not recommend them for swimming. Period swimwear is a separate kind of product, and we have not ranked it in this guide. If you want to swim on your period, check the swim style's own listing for what it covers.
Where can you buy period underwear in Australia?
AuntFlo, Modibodi, Love Luna, Boody and Rudie sell direct from Australian websites, Bonds sells online and in stores, and Thinx ships from the US. Check the label for a stated capacity in millilitres and compare it with the figures here.
Is there plus size period underwear in Australia?
Yes. AuntFlo runs XS to 4XL, Thinx to 4X, Boody to 4XL and Bonds to size 24. Check the chart against your measurements and size up if you are between sizes.
How do you choose period underwear for your flow?
Match absorbency to your flow. Use a light pair like the 7.5 ml AuntFlo Seamless Period G-String at the start and end of a cycle and a 50 ml style with a long gusset, like the AuntFlo Boyfriend Briefs 2.0, on heavy days and overnight. Pick by the stated figure, not the label.
What else should you sort out while you are here?
Period undies live or die by your laundry setup and your rotation, so most of these pair with this guide. The first two let you mix light and heavy styles in one order, which is where the bundle pricing helps.
- Build Your Cycle Set, AuntFlo's page for putting light and heavy styles together.
- AuntFlo bundles, for ready-made multi-pair packs.
- A mesh laundry bag, for washing a rotation without stretching the elastic.
- An indoor clothes airer, if you are in a cooler part of the country and drying is the bottleneck.
About the author
Best Period Undies is an Australian buying guide written by a small editorial team. We focus on everyday things people buy more than once, and we report what each listing actually states rather than its marketing language.
Detailed reviews
AuntFlo
AuntFlo Boyfriend Briefs 2.0
Our best overall pick if you want one style built for heavier days and overnight wear. It holds up to 50 ml, about 8 to 10 tampons, matched here only by the Modibodi Super, and the gusset extends from front to back rather than stopping halfway. The body and lining are 95 percent cotton, and the brief comes in XS to 4XL. One reviewer says they feel secure wearing them to bed on their heaviest flow day, and another, recently postpartum, says they have not bled through once. The fit is the caveat: the brand itself says this style runs a little small.
Buy 2 get 1 free · Buy 3 get 2 free
Single pair $44.99, five pairs $134.99 at auntflo.au, as of 22 October 2026.
In stock at auntflo.au, checked 22 October 2026
Shop at AuntFloBuy 2 get 1 free and buy 3 get 2 free apply within the same style.
Modibodi
Modibodi Sensual Hi-Waist Bikini Super
This is the pair for anyone who wants the category's biggest name. Modibodi period undies come in the widest range here, covering period, teen, swim, sleep and bladder leaks, and the Super absorbency states the same 50 ml as our top pick. The black-coloured lining is designed to stop visible stains, and Modibodi underwear is listed as OEKO-TEX Standard 100 certified. On ProductReview.com.au, 65 percent of reviews are positive, with heavy flow, overnight wear and teen first periods the common reasons to buy. It sits second on value and consistency: at its $39.99 full price it costs about $13 a pair more than AuntFlo's five-pack price, and recent reviews raise durability.
modibodi.com full price as of 22 October 2026, subject to change.
Compare with our #1 pickThis button opens our #1 pick, the AuntFlo Boyfriend Briefs 2.0.
Bonds
Bonds Bloody Comfy Period Full Brief Heavy
A sensible first pair to test the category. Bonds publishes its whole absorbency ladder: ultra light about one tampon, moderate about three, heavy about four, overnight about eight. This is the heavy rung, and knowing that up front is worth more than any star rating, because 4 tampons' worth is well short of a 50 ml brief. The body and gusset lining are cotton and elastane, and Bonds says the gusset was lengthened for more coverage. The fit is snug by design, so size up if you want more room. In the CHOICE trial from 2021, the Bonds heavy brief scored 76, with 91 percent of triallists reporting no leaks.
bonds.com.au RRP range $19.99 to $34.99. Bonds showed 40% off sitewide on 22 October 2026.
Compare with our #1 pickThis button opens our #1 pick, the AuntFlo Boyfriend Briefs 2.0.
AuntFlo
AuntFlo Seamless Period G-String
The answer to visible lines on light days. It holds 4.6 stars from 323 reviews, the top rating here, and at 7.5 ml, about 1.5 tampons, it is built for spotting, discharge and the first and last days of a cycle rather than heavy flow. The outer is a seamless nylon and spandex knit with a 95 percent cotton inner, and it carries the same four-layer system and OEKO-TEX Standard 100 certificate as the Boyfriend Briefs. Reviewers describe the fabric as buttery soft and say nothing shows under gym tights. Unlike the Boyfriend Briefs, AuntFlo says this style runs true to size, from XS to 4XL.
Buy 2 get 1 free · Buy 3 get 2 free
Single pair $35.99, five pairs $107.99 at auntflo.au, as of 22 October 2026.
In stock at auntflo.au, checked 22 October 2026
Shop at AuntFloBuy 2 get 1 free and buy 3 get 2 free apply within the same style.
Love Luna
Love Luna Period Full Brief
The budget rotation pick. At $15, Love Luna period undies cost about a third of a single AuntFlo pair, and the brand is Australian owned. The medium+ full brief states 15 to 20 ml, about 3 to 4 regular tampons, the Super about 40 ml, and Love Luna says its range was independently tested for PFAS (PFOA and PFOS) with no trace detected, without naming the lab. It also states about 50 washes per pair. The site shows 2,238 reviews, and in the 2021 CHOICE trial the Love Luna bamboo brief scored 75 with the highest comfort score. The reservation is capacity: the price per millilitre is closer than the sticker suggests.
loveluna.com.au price as of 22 October 2026, subject to change.
Compare with our #1 pickThis button opens our #1 pick, the AuntFlo Boyfriend Briefs 2.0.
Thinx
Thinx Comfort Stretch Hiphugger
The answer for anyone who wants the original brand and the longest trial here. Thinx offers a 45-day trial and sizes up to 4X, and its absorbency tiers are named by use, such as all day or all night, rather than by millilitres. Thinx period undies ship to Australia from the US store, with standard courier delivery taking 6 to 12 business days, and prices of about $40 to $43 a pair appear to be in US dollars. In the 2021 CHOICE trial, the Thinx Super Cotton brief scored 73 and the Hiphugger 69, with no-leak results of 80 and 63 percent, the lowest of the brands tested. The reservation is the missing capacity figure: you cannot compare it to a 50 ml brief.
thinx.com catalogue price as of 22 October 2026, appears to be USD.
Compare with our #1 pickThis button opens our #1 pick, the AuntFlo Boyfriend Briefs 2.0.
Boody
Boody Period & Leak Proof Undershorts 3" Moderate
The answer if softness is what you shop for. Boody is a bamboo basics brand, and these undershorts give full, high-rise coverage that the listing pitches for overnight wear. It holds up to 3 tampons or 15 ml, uses a three-layer gusset of cotton, bamboo and cotton, and modal and seaweed fibre, and says the product is certified as 100 percent PFA-free without naming the certifier. Sizes run XS to 4XL. One reviewer calls them by far the most comfortable period pants they own. The reservation is capacity: 15 ml is a moderate day, whatever the overnight pitch says.
boody.com.au price as of 22 October 2026, subject to change.
Compare with our #1 pickThis button opens our #1 pick, the AuntFlo Boyfriend Briefs 2.0.