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.

• 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.*
• 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.
• Easy to drink bite valve auto-seals after each sip, eliminating annoying drips.
• Easily thread the filter onto some of the most popular running softflasks, flexible bottles and water storage containers.
• Plugs into filter valve and threads onto a HydraPak Stow or bottle of clean water for backflushing the filter to restore its flow rate.
• Weight: 36 g / 1.3 oz
• Dimensions: 42mm
• Material: ABS, POM, Silicone, Hollow Fiber
• Care: Avoid freezing filter. Freezing may ruin the hollow fiber membrane. If in freezing conditions we recommend you keep the filter in your pocket or near your body to prevent freezing.