Hydrapak 42mm Filter Cap

The Hydrapak 42mm Filter Cap is a lightweight and compact filter cap that allows you to quickly and easily purify water while hiking and camping. It screws directly onto Hydrapak Seeker reservoirs, Flux bottles, UltraFlask and SkyFlask water bottles, turning them into practical water purification solutions.

With this filter, you can either filter water directly for drinking or purify water for filling other containers. The filter effectively removes 99.99% of bacteria (E. coli) and 99.9999% of parasites (Cryptosporidium, Giardia), and can process up to 1,500 liters of water at a rate of over 1 liter per minute.

The cap has a protective cover that prevents the mouthpiece from getting dirty, as well as a fast flow valve that allows for effortless drinking with one hand.

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Note: Avoid freezing the filter as this can damage the hollow fiber membrane. In cold conditions, keep the filter in your pocket or close to your body.