The lightweight, 2L CamelBak ThermoBak is the perfect solution for on-the-go hydration. The rugged and durable 2L ThermoBak comes equipped with a leak-proof screw-cap, insulated PureFlow tube, and CamelBak's patented Big Bite Valve. The pack offers a sternum strap for added stability and closed cell insulation and a neoprene tube cover to keep water cool or warm for hours. The pack also includes CamelBak's HydroLink Modular Connection System with positive shut-off HydroLock, an exterior fillport with ergonomic handle for filling on the go, quick-release shoulder straps that unclip for easy removal, and a tough, abrasion-resistant 1000D Cordura fabric exterior. Convenient Velcro strap management. CamelBak lifetime warranty.