A hollow-fibre filter sold with the bottle it screws onto, publishing both a 0.1 micron pore size and a 4000 litre cartridge life — and, because the bottle comes in the box, never needing to say what thread the filter takes.
The bottom line A complete set that publishes both comparison figures, and whose missing thread size is hidden by the fact that its own bottle is included. That is convenient, and it is also the limit.
What this listing puts on record
A pore size of 0.1 µm, a hollow-fibre membrane, a cartridge life of up to 4000 litres, a foldable BPA-free bottle of 0.5 litres, a lanyard and a carabiner.
Two figures, published together
0.1 micron and 4000 litres. Both appear in the bullets, and having both is what lets this listing be compared with the rest of the hub rather than only with the shelf around it.
No flow rate, though. On a squeeze bottle the flow is what your hand feels, and no figure is given for it.
Why the thread question is quieter here
The filter is stated to screw onto the bottle supplied with it. That removes the compatibility problem from the box and leaves it entirely outside: nothing in the listing says what thread the filter takes, so a second bottle, a soft flask or a hydration reservoir is a measurement you would have to take.
How the maker’s claims are written here
The bullets put a 99.99 % figure against bacteria and germs, and mention microplastic particles. Reported as a claim, that is the maker states 99.99 % of bacteria — the sentence keeps its author. What the filtered water may then be used for is not something this page decides; it belongs to the maker’s instructions and to the authority wherever you are filling.
Before ordering
Work out how often you can refill on the route you actually walk. Half a litre is a pleasant thing to carry and a short thing to drink, and the cartridge figure only pays off if you are filling from moving water regularly.
Availability
Selling between 25 € and 34 € across the German, French, Italian and Spanish Amazon stores when this page was checked.
It also sells on the British Amazon store in the local currency, which the range above does not cover — that range counts euro stores and nothing else.
Nothing came back from the American Amazon store, so the buy link there opens a local search instead of a page that is not there.
Every figure in this section is what Keepa returned on the day this page was last updated. Prices and offers change without notice.
Prices quoted in this text were read on 6 September 2026. The live price is at the top of the page.
What it does well, and where it gives way
Strengths
Publishes a pore size and a cartridge life together, which is the pair this hub compares on
Names the element as a hollow-fibre membrane rather than leaving the type open
Arrives as a set — filter, foldable 0.5 litre bottle, lanyard and carabiner — so nothing else has to fit for it to work
Compromises
No thread size, which matters more here than it looks: the set works because its own bottle is in the box, and any other bottle is a guess
No flow rate, on a format where you are squeezing a soft bottle by hand
No weight for the filter or the bottle, and 0.5 litre is a small carry for a full day
Specifications
Micron rating
0.1 micron — stated as a pore size of 0.1 µm
Filter element type
Hollow-fibre membrane — stated
Stated flow rate
Not published on the listing
Cartridge life
Up to 4000 litres — stated
Weight
Not published on the listing
Format
Screw-on filter supplied as a set with a foldable 0.5 litre BPA-free bottle, a lanyard and a carabiner — stated
Bottle thread compatibility
Not published on the listing — the filter is stated to screw onto the bottle supplied in the set, and no thread size is given for anything else
Amazon reference
B0GWRNYTS4 (same reference on 5 Amazon marketplaces)
EAN
8721516268112
What people ask before buying
Is 0.5 litre enough between refills?
It is the bottle capacity the maker states, and it is small. The format assumes you refill at the source rather than carry a load, which suits streams and rivers more than a dry ridge.
Can the filter be used on another bottle?
The listing does not say. It states that the filter screws onto the bottle supplied, and gives no thread size, so any other bottle is something to measure yourself rather than assume.
Press filter bottle · 500 ml · 0.2 micron stated · hollow fibre with carbon · 1500 litre cartridge
A 500 ml press bottle that publishes volume, pore size, element type and cartridge life — four of the seven columns this hub compares — and quotes the coarsest micron figure of the six filters here that give one.
Best for: A short walk or a run where one small bottle refilled at the stream is the whole water plan.
Press bottle · 710 ml · 250 litre replaceable cartridge · no pore size published
A 710 ml press bottle with a replaceable cartridge rated at 250 litres, and the most talkative claim list on this shelf — every one of which is written here as the maker’s claim, because no pore size is published to check any of it against.
Best for: Travel where one bottle is treated at a time and the cartridge is expected to be replaced as a routine cost.
Foldable filter bottle · 750 ml · three-stage element · 200 litre cartridge · no pore size given
A rollable 750 ml filter bottle that publishes its volume and a 200 litre cartridge life, and gives no pore size at all — the shortest stated cartridge figure on this shelf with the least said about the element behind it.
Best for: Occasional use where the bottle folding flat matters more than the specification behind the element.
