Introducing the 350ml Sky Flask Speed water bottle, the perfect companion for your mountain running adventures in the High Sierra! This lightweight, soft flask is designed to fit your hand perfectly, with an adjustable strap that cinches down to fit different hand sizes. The SpeedFill™ cap flips open for quick refills and snaps closed for a spill-proof seal, so you can easily drink on the go from the high-flow self sealing bite valve.