Osprey Packs Rev 18 Hydration Pack 100% Man Made Materials Imported 2.5 Liter Hydraulics LT Reservoir provides 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 The Rev Biostretch Bodybelt featuring stabilization wings is designed for stability and comfort during high activity endeavors. 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 Four interior zip pockets. Five exterior pockets