A collapsible hydration flask.
The soft flask has a high-flow self-sealing bit valve, a 42mm opening with twist locking cap, flexible hand strap and the flask shrinks as you drink, reducing water movement.
Great for the minimalist runner but while the hand strap was nice, I wish it had a clip for those who do not want to hold the flask while running and can clip it on to their shirt or pocket.
But overall, an awesome Hydrapak SF500 Handheld Hydration Flask!
