Katadyn · BeFree AC · 1 litre · double-layer
Katadyn BeFree AC 1.0L Black
the rugged one among filter flasks
A soft flask in a pack chafes against zips, stones and tent pegs. The double-layer version is built for exactly that – at 76 grams.
Buy the Katadyn BeFree AC 1.0L – one litre in the rugged version
The Katadyn BeFree AC 1.0L in black is the toughest filter flask in the BeFree range: the soft flask is built in a double layer, making it more dimensionally stable and abrasion-resistant than the single-layer variant. Filtration is two-stage – the EZ-Clean Membrane with its 0.1 µm pore size retains bacteria, protozoa and sediment, while the activated carbon core behind it reduces chlorine along with taste and odour compounds. One litre of volume bridges longer stretches between water sources, and at 76 grams the empty flask stays a lightweight.
Where soft flasks usually give up
What the second layer really delivers day to day
Soft flasks have a well-known weak point: they are thin, and that is exactly what makes them light and packable. In a rucksack, though, they sit next to zips, stove lugs and tent pegs, get pressed against rock and dragged over gravel while filling. The double-layer construction of the 1.0-litre model addresses precisely that: the second material layer gives the flask more structure, so it stands better when filling from shallow water, and it raises abrasion resistance compared with single-layer construction. The price is four grams more than the 0.5-litre version – at twice the volume.
One litre – the range between two water sources
The difference between half a litre and a full one shows not at the stream but in between. On ridge paths, in karst country or in heat, water sources are often one to two hours apart – and then volume decides whether you walk on relaxed or start rationing. One litre covers those gaps without having to carry an extra unfiltered reserve bottle. For cooking in camp or for several people, a Gravity system still remains the more efficient solution.
The carbon stage – two service lives in one cap
The two filter stages last different lengths of time: the EZ-Clean Membrane is rated for up to 1'000 litres, the activated carbon core for around 200. That is not a contradiction but intentional – the carbon stage unscrews from the cap. Once exhausted, you remove it and carry on filtering with the membrane. The same move helps when you need speed: without the second stage the flow rises noticeably. At clear mountain streams people therefore often leave the carbon off and fit it only where chlorine or algal notes are a nuisance.
What the filter does – and what it does not
The 0.1 µm membrane retains bacteria, protozoa, sediment and microplastics; the activated carbon reduces chlorine along with taste and odour compounds. Viruses are smaller than 0.1 µm and pass through – in regions with that risk you need additional chemical disinfection or UV treatment. Heavy metals and salt are not removed; the carbon content of a drinking flask is too small for that.
Key features – Katadyn BeFree AC 1.0L Black
- 🛡️ Double-layer soft flask – dimensionally stable and abrasion-resistant
- 🥤 1 litre volume · colour black
- ⚖️ 76 g when empty
- 🔀 Two-stage filtration – EZ-Clean Membrane plus activated carbon
- 🔬 Pore size 0.1 µm · hollow fibre
- 💧 Membrane up to 1'000 L · carbon up to 200 L
- 🔓 Carbon stage unscrews – can also be run without it
- ⏱️ Up to 2 L/min (membrane, without the carbon stage)
- 🦠 Removes bacteria, protozoa, sediment, microplastics
- ⚫ Reduces chlorine, taste and odour compounds
- 🧼 Cleaned by shaking – no tools required
- ♻️ TPU · PVC- and BPA-free · 42 mm thread
- 🚫 Not effective against viruses, heavy metals and salt
- 🇨🇭 Katadyn · Swiss water treatment since 1928
1.0 litre, 0.5 litre or a Gravity system straight away?
The 1.0-litre version is the all-rounder of the BeFree range: enough volume for longer stretches between water sources, and thanks to the double-layer flask robust enough for multi-week trips. The 0.5-litre version is the choice when weight and packed size are everything – typically for trail running, where two small flasks sit better in a vest than one large one. And as soon as several people are being supplied or cooking water prepared, a BeFree Gravity is the more efficient solution, because there gravity does the work instead of hand pressure. Buy the Katadyn BeFree AC 1.0L at Swiss-Sale.ch – your Swiss specialist shop for outdoor gear with fast shipping.
Who is the Katadyn BeFree AC 1.0L Black for?
The 1.0-litre filter flask is aimed at trekkers, long-distance hikers and bikepackers who bridge longer stretches between water sources and want a flask that takes daily pack life without being handled gently.
Technical Specifications – Katadyn BeFree AC 1.0L Black
| Model | Katadyn BeFree AC 1.0L |
|---|---|
| Brand | Katadyn |
| Product type | Water filter (filter flask) |
| Colour | Black |
| Filtration | |
| Design | Two-stage – EZ-Clean Membrane and activated carbon core |
| Filter technology | EZ-Clean Membrane™ · hollow fibre |
| Pore size | 0.1 µm (0.0001 mm) |
| Flow rate | up to 2 L/min (membrane) |
| Membrane capacity | up to 1'000 L (depending on water quality) |
| Carbon capacity | up to 200 L |
| Removes | Bacteria · protozoa · sediment · microplastics |
| Reduces | Chlorine · taste and odour compounds |
| Does not remove | Viruses · heavy metals · salt |
| Cleaning | Shake the filter in water – no tools |
| Flask | |
| Volume | 1.0 L |
| Construction | Double-layer soft flask – increased structure and abrasion resistance |
| Flask material | TPU · PVC- and BPA-free |
| Thread | 42 mm |
| Special feature | Carbon stage unscrews · flask collapses when empty |
| Dimensions & identification | |
| Weight | 76 g |
| Dimensions | 27.3 × 10.7 × 7.8 cm |
| Manufacturer part no. | 8021403 |
| EAN | 0604375214033 |
| Warranty | 2 years manufacturer warranty + 2 years Swiss statutory warranty |
Package Contents – Katadyn BeFree AC 1.0L Black
- 🥤 Katadyn BeFree AC 1.0L double-layer soft flask, black
- 🔬 BeFree filter EZ-Clean Membrane
- ⚫ Activated carbon stage removable
Frequently Asked Questions – Katadyn BeFree AC 1.0L Black
Answers around the Katadyn BeFree AC 1.0L Black – from the double-layer flask and the carbon stage to cleaning, frost protection and Swiss shipping.
