The Marmot Kompressor Zip is part of a unique collection of mountain training and endurance sport packs that are centered around a soft flask that conforms comfortable to the shape of your hand. It is easy to use and clean and allows you to take your hydration everywhere you go.The Kompressor Zip runs the gamut from short backyard trails to pacing your partner on the Leadville 100. Working closely with the hydration industry leader Hydrapak, Marmot crafted a durable yet lightweight hydration system that centers on a 500 ml Soft Flask. Designed to conform to the shape of your hand, compression straps across the hand clip back to reduce the nuisance of dangling webbing. A highly compressible compartment fits a cell phone or light jacket.