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 sucking out that Tailwind goodness.
The flexibility of the soft flask means it can fit into your existing gear: successfully tested with Ultimate Direction, Salomon and Nathan vests as well as countless bicycle jerseys and backpacks.
Dimensions: The hard plastic top of the flask measures in at 8.5 x 6.5cm wide and stands 7cm with the rest of the flask being able to collapse in to the hard top when empty. Holds up to 500ml/17oz.