Run fast, filter faster. The UltraFlask Filter Cap threads seamless onto all of HydraPak’s 42mm running flasks and handhelds for a lightweight, straightforward filtration solution. Featuring a traditional bite valve and cap design, runners can drink freshly filtered water directly through the high-flow Blaster valve.
*Effectively removes common waterborne bacteria, such as E.coli (99.999%) and parasitic cysts (99.9999%) per HSF 42.
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LIGHT & COMPACT
Minimal design and lightweight materials make this filter the ideal choice for runners. It takes up no extra space when stored or threaded directly onto a flask.
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HIGH-FLOW
Easy to drink bite valve auto-seals after each sip, eliminating annoying drips.
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42MM THREAD COMPATIBLE
Easily thread the filter onto some of the most popular running softflasks, flexible bottles and water storage containers.
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INCLUDED BACKFLUSH ADAPTER
Plugs into filter valve and threads onto a HydraPak Stow or bottle of clean water for backflushing the filter to restore its flow rate.
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FAST & SAFE FILTRATION
The integrated filter removes Escherichia coli bacteria, Cryptosporidium parvum cysts, and Giardia Lamblia from approximately 1,500 liters of water at a rate of >1L per minute.
