Hydrapak Ultraflask Speed Hydration Soft Flask (w/straw)

Go big. The largest of our ultra-light series, the UltraFlask Speed 500/600 ml holds more so you can go the distance. Its soft material allows it to fit snugly in most vest pockets and it shrinks as you drink to minimize water movement. Topped with our newest SpeedFill™ cap feature that makes aid station refills a breeze.