Hydrapak Big Sur Hydration Backpack with Plug-N-Play New Hypalon reinforced shoulder straps Air Chairman ventilated back design Tons of storage feature two zippered pockets and two large mesh pockets Includes 100oz (3.0L) Reversible Reservoir II with Plug-N-Play valve 450cu. in. (7.4L) of gear storage. Includes removable waist and sternum straps