A straw filter sold with a gravity bag, publishing a 0.1 micron pore size, a 5300 litre cartridge life and — unusually for this shelf — a stated way of restoring flow without carrying a separate syringe.
The bottom line The longest stated cartridge life here, with a pore size to go with it and a stated way of keeping the flow up. What it never publishes is the flow itself.
What this listing puts on record
A 0.1 µm ultrafiltration membrane, coconut-shell activated carbon, a cartridge figure of up to 5300 litres, a super-wash design stated to make a separate backflush syringe unnecessary, a gravity water bag, and ends that are stated to come apart for use with bags or bottles.
The figure the hub is built around
5300 litres. That is the highest cartridge figure in this family, and it comes with a pore size rather than in place of one, which is the combination that makes a listing comparable.
And still no flow. A gravity bag is a format defined by flow: you hang it and go and do something else, and how long that takes is the whole experience. No litres per minute appear anywhere.
The part most listings do not mention
Backflushing is what keeps flow up as an element loads, and on most of this shelf it means a syringe in a side pocket. The maker states a design that does without one. That is a handling claim rather than a measurement, and it is the kind of handling claim that decides whether a filter is still being used in a year.
How the maker’s claims are written here
The bullets describe chlorine, particles, sediment, sand and taste. Where a percentage or a substance is named, it stays the maker’s sentence: the maker states what it filters, and this page reports the claim rather than repeating it as fact. Nothing here says what the water leaving the straw may be used for; that is for the maker’s instructions and the local authority where you fill.
Before ordering
Decide whether you want the bag or the straw. The bag is the reason to buy this rather than a bare straw, and it is also the part that needs a branch, a pole or a rock to hang from at the camp you actually use.
Availability
Selling between 28 € and 30 € 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 the longest cartridge figure on this shelf at 5300 litres, alongside a 0.1 micron pore size rather than instead of one
States a super-wash design that needs no separate backflush syringe, which is the accessory people lose first
Both ends are stated to come apart, so the same element serves the supplied gravity bag and a bottle
Compromises
No flow rate, which on a gravity setup is the difference between filling a pot and waiting for one
No weight for the straw or the bag
The bottle it can be combined with is never given a thread size
Specifications
Micron rating
0.1 micron — stated as a 0.1 µm ultrafiltration membrane
Filter element type
Coconut-shell activated carbon with a 0.1 micron ultrafiltration membrane — stated
Stated flow rate
Not published on the listing
Cartridge life
Up to 5300 litres — stated
Weight
Not published on the listing
Format
Straw supplied with a gravity water bag; the maker states both ends come apart and that it can be used with bags or bottles
Bottle thread compatibility
Not published on the listing — the maker states it can be combined with water bottles, and gives no thread size
Amazon reference
B08KZDDMVT (same reference on 5 Amazon marketplaces)
EAN
0840814188705
What people ask before buying
What is a backflush, and why does the design matter?
Backflushing pushes clean water the wrong way through the element to clear what has collected on it, and it is how flow is restored as a cartridge loads. Most makers supply a syringe for it; this one states a design that does not need one, which is one fewer small part to lose.
Does 5300 litres mean 5300 litres?
It is what the maker states, and cartridge figures on this shelf assume a fair water source and regular backflushing. The maker’s own instructions on cleaning and storage are what decide how close a real element gets.
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.
Filter and bottle set · 0.1 micron stated · hollow-fibre membrane · 4000 litre cartridge · 0.5 L bottle
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.
Best for: A day walk where the water is refilled often and the whole set can live in a hip pocket.
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.
