In the saddle of your cross-country bike or in your leather boots, you"ll stay hydrated and well-equipped with this Platypus Origin 22 Hydration Pack on your back. Suited for both small and large individuals, the Origin 22-liter pack comes in 18- or 20-inch BioCurve (back panel) size for the ideal fit. Stash the extra gear, food, and fluids you need for a full day"s adventure without sacrificing a small, streamlined design.