The Camelback Octane Dart is an excellent option if you are looking to hit the trails and keep yourself hydrated. The Reservoir can store up to 50oz. of water that is easily reachable on the move. Breathable Air Mesh will help keep your back cool, and comfortable on the hottest days. A Sternum Strap Adjuster allows for a secure and comfortable fit. The Reflective Patch on the pack ensures that you are visible at night to drivers and other motorists. Breathable Air Mesh-Keeps you cool as you sweat., Essentials Organizer Pocket-Keeps valuables secure while you are on the road or the trail., Sternum Strap Adjuster-Allows for a secure and comfortable fit.,