HydraPak Contour Hydration Reservoir - Smart design meets peak performance. HydraPak developed a innovative, new Contour reservoir to be lightweight, low profile and rugged. A 3D bottom, Shape-Loc baffles and side exit port combine to provide superior fit and performance in the widest variety of packs for extended backpacking and hiking adventures. Features UNIVERSAL HANGER - Compatible with clips, hooks & loops in a wide range of packs. COMET BITE VALVE - Lightweight, self-sealing valve can be opened & locked with one hand. GRAB HANDLE - Soft touch flexible handle simplifies filling & carrying. SLIM PROFILE - Shape-loc baffles create a low reservoir profile & increase stabilization during activities. REVERSIBLE - Use the internal drying tab to reverse the reservoir for deep cleaning and complete drying.