Where to Buy

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Retailers' Descriptions

Here's what other sites are saying:

Ultraspire Running Packs Reservoir-1 L mpn23417. Patent pending valve with ultimate fluid delivery. Practically an automatic watering system. With the UltrAspire Reservoir there is no need for an on/off switch in addition to a bite valve like all other systems on the market. Simple in simple out doesn't get caught on things. Just be careful: you'll run out of fluids faster because you'll be able to get it with less effort.

- CampSaver.com

Equip your pack with the UltrAspire Bladder for stellar hydration while you mountain bike or run a marathon. This BPA-free hydration reservoir features a wide, open Slide Seal mouth for easy refilling and turns inside-out for simple cleaning.

- Backcountry.com