Flexible flask ideal for gels that compresses as you drink it to eliminate water bouncing inside and reduce sucking effort. The valve won't leak until you bite it.
Eliminate the annoying sloshing of water in your bottle. This soft flask compresses as you drink from it, letting you know how much you have left to drink.
Minimal construction and shrink while you drink means it gets lighter as you run!
Super fast and accessible, a light squeeze gives ample hydration, without leaking.