INSULATED RESERVOIR & TUBE: Designed to keep water colder longer and won't sweat in warm temperatures. GRAB TAB: Light and flexible grab tab makes it easy to pull in and out of packs, carry and fill. The Slide-Seal top opens extra wide for filling and adding ice. SLIM PROFILE: Two Shape-loc baffles create a low reservoir profile & stabilize water movement during activities. HIGH FLOW VALVE: Lightweight, self-sealing Comet bite valve can be opened & locked with one hand. 100% BPA BPA FREE AND EASY TO CLEAN: Made from the highest quality materials, backed by a lifetime warranty.