Run fast and filter faster with the UltraFlask™ + Filter Cap, designed to seamlessly thread onto HydraPak’s 42 mm running flasks and handhelds. Offering a lightweight and easy filtration solution, it features a traditional bite valve and cap design, allowing runners to drink freshly filtered water* directly through the high-flow Blaster valve.

Features

• Fast and safe filtration: Removes common waterborne bacteria and parasitic cysts, including E. coli, Cryptosporidium parvum and Giardia lamblia, from up to 1,500 litres of water at a flow rate of more than 1 litre per minute.*
• Light and compact: Minimalist design and lightweight materials make it ideal for runners, with no extra bulk whether stored or threaded directly onto a flask.
• High-flow design: Blaster bite valve auto-seals after every sip for smooth drinking without leaks or drips.
• 42 mm thread compatibility: Fits HydraPak running soft flasks, flexible bottles and other water storage containers with a 42 mm thread.
• Included backflush adaptor: Helps restore flow rate by backflushing the filter with a HydraPak Stow or clean water bottle for long-lasting performance.

*Effectively removes common waterborne bacteria, including E. coli at 99.999%, and parasitic cysts at 99.9999%, per HSF 42.