HydraPak Velocity IT (1.5L or 2L Hydration Reservoir) - Insulated Water Bladder/Reservoir for Hydration Pack – Self-Sealing Bite Valve, Leak Proof and Dishwasher SafeINSULATED RESERVOIR & TUBE: Keeps water colder longer and wont sweat in warm temperatures. FITS VESTS & PACKS: A perfect fit for most standard hydration vests and packs. Universal hanger is compatible with clips, hooks & loops in a wide range of packs. GRAB TAB: Light and exible grab tab makes it easy to pull in and out of packs. Slide Seal top opens extra wide, making it easier to ll and add ice. HIGH FLOW VALVE: Lightweight, self sealing Comet bite