UltraFlask™ 42 mm Filter Cap

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. Perfect for trail runners and endurance athletes, the UltraFlask™ + Filter Cap combines lightweight convenience with effective water filtration, so you can stay hydrated without slowing down. *Effectively removes common waterborne bacteria, such as E.coli (99.999%) and parasitic cysts (99.9999%) per HSF 42.