Osprey Packs Rev 1.5 Hydration Pack 100% Nylon Imported 1.5 Liter Hydraulics LT Reservoir included for on the go hydration Rev Series packs feature the Biostretch Body Wrap harness designed to move with you during high activity endeavors. A removable drop down DigiFlip media pocket provides secure storage and quck access to all manner of touch screen mobile devices. Dual stretch mesh harness pockets provide easy access to energy snacks and other quickly needed items. Features a reverse spacer mesh backpanel which is a highly breathable mesh wrap providing a soft, irritation free contact surface for the ultimate in backpanel comfort