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The Hydrapak 28mm Filter Kit is a compact inline water filter that threads onto 28mm bottles and soft flasks or clicks into Plug-N-Play reservoirs, so you can drink from streams on long trail days. It is a small, light piece of insurance that turns a creek crossing into a refill stop.
It suits ultra runners, fastpackers and hikers heading somewhere without taps. Water passes through a hollow fibre membrane that Hydrapak says removes E. coli and parasitic cysts, and you can drink through it as you go or use it to fill another container. A cap adapter and backflush adapter let you fit it to different setups and flush it clean between trips. Hydrapak rates the filter for about 1,500 litres, at a flow rate of more than 1 litre per minute.
It plugs straight into the Velocity Reservoir and the Velocity IT. Carrying 42mm soft bottles or a handheld instead? The 42mm Filter Cap does the same job on the wider thread.