We are measuring capacity ourselves

Every number on our cross-brand table is a brand's own claim, graded for how it was sourced. This page adds the missing column: the same products measured the same way, by us, with the method published before the results. The method and product list are published below; measured results land here the day testing completes.

By PeriodFinder, Editorial team

The method, in full

A comparative water-capacity screen - water poured onto the gusset in 5 mL increments with a 10-second pause between pours, until water pools or escapes; 3 runs per product; the median is reported. Water is thinner than menstrual fluid, so absolute numbers run HIGHER than real-world capacity: the value of this screen is relative - products tested the same way, ranked against each other and against their own claims. It is a comparative screen, not a clinical measurement.

Self-funded. No brand supplied product, money, or review copy. Brands are invited to submit their own lab data or corrections, which we publish alongside - the same corrections policy as our methodology.

What we are testing

ProductBrand claimMeasured medianStatus
Thinx Everyday Comfort Bikini (All Day)100 mLnot yet testedawaiting test
Knix Super Leakproof Cotton Bikini36-63 mLnot yet testedawaiting test
Knix SuperPlus Leakproof Dream ShortSleep-short cut - the only adult Ultra single stocked in mid sizes at order time.63-99 mLnot yet testedawaiting test
WUKA Ultimate Midi Brief - Super Heavy60 mLnot yet testedawaiting test
WUKA Stretch Seamless Midi Brief - Heavy20 mLnot yet testedawaiting test
Saalt Leakproof Seamless Brief40-50 mLnot yet testedawaiting test
Saalt Leakproof Cotton Bikini20 mLnot yet testedawaiting test
The Period Company The Bikini Period. in SportyStretch45 mLnot yet testedawaiting test
Modibodi Basic Mid-Rise Super (3-pack)3-pack: each run uses a fresh pair (the protocol's preferred replicate condition).50 mLnot yet testedawaiting test
Modibodi Classic Bikini Moderate (Cashew)30 mLnot yet testedawaiting test

Method v1.0 · results pending · absolute values run high vs. real use (water screen) · read each number against its own claim, not as a leak-free guarantee.