HydraPak UltraFlask+ Filter Cap

Fill up. Screw it on. Keep moving.

The HydraPak UltraFlask+ Filter Cap turns a compatible 42mm soft flask or flexible bottle into a lightweight backcountry water filter. It threads directly onto HydraPak’s 42mm running flasks and handhelds, giving trail runners and fast-moving hikers a simple way to refill from backcountry water sources without carrying a separate filtration setup.

Just fill your flask, thread on the filter cap, and drink normally through the high-flow Blaster bite valve. The hollow-fiber filter removes common waterborne bacteria and parasitic cysts while maintaining a flow rate of more than 1 liter per minute.

At only 1.3 ounces, it adds very little weight or bulk to your running kit.

Why We Like It

For trail running and fast-and-light hiking, simple is good. Instead of stopping to filter water into another container, you can fill your flask at a water source and keep moving. If you already use HydraPak 42mm flasks, this is an easy way to add filtration capability to your existing setup.

Filtration

The hollow-fiber membrane effectively removes common waterborne bacteria and parasitic cysts, including E. coli, Giardia and Cryptosporidium.

• Filters approximately 1,500 liters

• Flow rate greater than 1 liter per minute

• Lightweight hollow-fiber filtration

• No batteries or chemicals required

Details

• Threads directly onto compatible 42mm soft flasks and flexible bottles

• Designed for HydraPak 42mm running flasks and handhelds

• High-flow Blaster bite valve

• Bite valve automatically seals after each sip

• Drink filtered water directly from your flask

• Compact design adds virtually no additional pack bulk

• Ideal for trail running, fastpacking and lightweight hiking