Hydrapak's UltraFlasks™ are designed to conform to the shape of your body, compressing as you drink - this means reduced sloshing and bouncing, less spillage, and an easier time drinking Tailwind. The clear design eliminates guessing how much hydration you have left and when it's empty, the pliable body of the flask collapses into the hard top, making this the perfect bottle for multi-stage events.
This soft flask is compatible with your existing gear and has been successfully tested with the majority of Ultimate Direction, Salomon, and Nathan vests as well as countless bicycle jerseys and backpacks.
