Ultraflask 42mm Filter Cap
Ultraflask 42mm Filter Cap
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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.

Product Features
Product Features
- Fast and Safe Filtration
Removes Escherichia coli bacteria, Cryptosporidium parvum cysts, and Giardia Lamblia from up to 1,500 litres of water at a rate of >1L per minute.* - Light and Compact
Minimalist design and lightweight materials make it an ideal filtration choice for runners, adding no extra bulk whether stored or threaded directly onto a flask. - High-Flow Design
The Blaster bite valve auto-seals after every sip, ensuring a smooth drinking experience without leaks or drips. - 42 mm Thread Compatibility
Fits easily onto HydraPak’s running soft flasks, flexible bottles, and other water storage containers with a 42 mm thread. - Included Backflush Adapter
Restore flow rate by backflushing the filter using a HydraPak Stow or a clean water bottle, ensuring long-lasting performance.
*Effectively removes common waterborne bacteria, such as E.coli (99.999%) and parasitic cysts (99.9999%) per HSF 42.
Product Specifications
Product Specifications
Diameter: 42 mm
Weight: 36 g
Length: 115 mm
Materials: ABS, POM, Silicone, Hollow Fibre

