The CamelBak Classic is CamelBak’s minimalist hydration pack. Simple, low-profile design boasts a 70oz reservoir with external access and a breathable back panel. There’s also a secure storage pocket, tail light tab and sternum strap for load stability. Pack design: carry multi-tool, wallet, an extra layer (secured by bungee) and keys; Diamond Mesh back panel with Lightweight Mesh harness enhances breathability and soft comfort; Zippered cargo pocket for stashing small essentials. 70oz Antidote Reservoir design: quick-seal cap tightens in just a quarter turn and is easy to open; Easy-to-clean, wide mouth opening; HydroGuard technology eliminates 99.9% of all bacteria; Includes Big Bite Valve and Pure Flow Tube.