HydraPak UltraFlask+ 42mm Filter Cap
Pickup currently unavailable at Boréal Running
Shipping & Returns
Shipping & Returns
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Products purchased at regular price or at less than 40% off may be returned within 15 days of receipt.
Products purchased at 40% off or more are considered final sale and cannot be returned or exchanged.
Why you’ll love it
Drink confidently wherever your adventure takes you
Access more water
Refill directly from natural water sources.
Drink with confidence
Helps reduce bacteria and protozoa.
Travel lighter
Reduces the need to carry extra water.
Hydrate with ease
Designed for quick drinking during activity.
Turn your flask into a portable filtration system
The HydraPak UltraFlask+ Filter Cap quickly converts compatible flasks into a portable water filtration solution. Whether you're trail running, hiking, bikepacking or camping, it helps provide access to drinking water when refill stations are unavailable.
Reliable hydration for longer adventures
Its integrated filtration technology helps reduce bacteria and protozoa commonly found in natural water sources. This allows you to refill from streams, lakes and other freshwater sources when conditions permit.
Built for trail running, hiking and bikepacking
Lightweight and compact, the UltraFlask+ Filter Cap integrates easily into your gear without adding unnecessary bulk. It is an excellent solution for ultrarunners, hikers and outdoor adventurers seeking greater self-sufficiency.
Why choose the HydraPak UltraFlask+ Filter Cap?
- Access water from natural sources
- Reduces bacteria and protozoa
- Ultralight compact design
- Ideal for trail and hiking
- Compatible with select HydraPak flasks
Which HydraPak flasks are compatible with this filter?
Which HydraPak flasks are compatible with this filter?
What contaminants does this filter help reduce?
What contaminants does this filter help reduce?
Is this product suitable for trail and ultrarunning?
Is this product suitable for trail and ultrarunning?
How should I maintain the filter?
How should I maintain the filter?
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