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.
 
Weight - Weighing just 24g empty, this flask is light as a feather
Dimensions - 225 x 77 mm / 8.86 x 3.03 in
Capacity - Holds up to 500ml/17oz