On the maker’s own page
Two Personal straw filters, blue, 4,000 liters each.
LifeStraw states a microfiltration membrane removing 99.999999 per cent of
waterborne bacteria including E. coli and salmonella, and 99.999 per cent of
waterborne parasites including giardia and cryptosporidium; removal of the
smallest microplastics found in the environment, down to 1 micron, and reduction
of turbidity down to 0.2 microns; that all claims are verified with laboratories
using standard testing protocols set by the US EPA, NSF and ASTM for water
purifiers; and 4,000 liters, or 1,000 gallons, of clean water per filter with
proper use and maintenance, described in the maker’s text as up to five years.
No pore size. No flow rate. No weight. No thread.
The only outside authority named on this shelf
EPA, NSF, ASTM.
Sixteen filters sit on this shelf. Fifteen name no testing body, or name
themselves — Sawyer states its units are tested three times to performance
standards by Sawyer, which is an internal standard described honestly.
On a shelf where everyone quotes nines, a protocol somebody else wrote is the
most useful sentence available.
Eight nines, and no pore size
The output without the input.
Ninety-nine point nine nine nine nine nine nine per cent of bacteria. Five nines
on parasites. One micron on microplastics, 0.2 on turbidity.
None of those is the pore size of the membrane, and the membrane’s pore size does
not appear.
This shelf’s introduction makes the micron rating the first of the three figures that
do the comparing here. Twelve of sixteen listings publish one. This is not one of
them.
A straw does one thing
Drink, and nothing else.
No pouch, no bottle thread, no in-line fitting, no pump, no backflush tool.
Four thousand liters per filter, two filters, thirty-two dollars. For a kit bag
that is the right shape of object; for a camp it is the wrong one.
Availability
The American Amazon store was listing it at about $32 at the time of writing.
Every figure here is what Keepa held on the day this page was last revised. Offers and prices shift without warning.
Prices quoted in this text were read on October 8, 2026. The live price is at the top of the page.
What people ask before buying
Why is there no micron rating?
That is the oddity of this page, and it is worth being precise about it. Two micron figures appear — microplastics removed down to 1 micron, and turbidity reduced down to 0.2 microns — and neither is the pore size of the membrane. This shelf's introduction makes the micron rating the first of three figures that do the comparing on this shelf, and twelve of the sixteen listings here publish one. What LifeStraw publishes instead is the output: 99.999999 per cent of bacteria and 99.999 per cent of parasites, which is eight nines and five nines, the most precise removal claim on the shelf — and, uniquely here, verified against named outside protocols rather than the maker’s own.
What do the EPA, NSF and ASTM protocols add?
They make the numbers checkable by someone other than the seller, and no other listing on this shelf offers that. Sixteen filters sit here. Fifteen either name no testing at all or name their own: Sawyer states that units are tested three times to performance standards by Sawyer, which is an internal standard honestly described. This listing states that all claims are verified with laboratories using standard testing protocols set by the US EPA, NSF and ASTM for water purifiers. On a shelf where every maker quotes nines, that is the single most useful sentence available.
Is a straw enough?
For an emergency kit, a travel bag or a day walk along water, yes — and for a camp, no. A straw filters as you drink and cannot fill a bottle, feed a hydration hose or supply a group, which the gravity and squeeze formats in this group exist for. There is also no backflush tool here, where three listings in this group supply one, and no weight published. What you get for thirty-two dollars is two filters, four thousand liters each, and the only externally verified claims on the shelf, in the format that needs nothing else to work.
