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The Hydrapak 42mm Filter Cap is a screw-on water filter cap that turns Hydrapak's 42mm soft bottles, water storage bags and handhelds into drink-through filters for the trail. Flip the dust cover, sip, and keep moving instead of hunting for a tap.
It suits trail runners and hikers who already carry 42mm Hydrapak bottles and want to refill from streams and lakes. A hollow fibre filter inside the cap removes E. coli and parasitic cysts as you drink, according to Hydrapak, and a high-flow nozzle sits under the dust cover. Thread it onto a Seeker bag or Flux bottle and that container becomes a filter you can drink from. Hydrapak rates the filter for about 1,500 litres, at a flow rate of more than 1 litre per minute.
It fits the SkyFlask Speed handheld and the UltraFlask+. Running with 28mm flasks or a Plug-N-Play reservoir? Grab the 28mm Filter Kit instead.