Designed for increased durability and volume, the Hydrapak Reyes hydration backpack offers plenty of hydration with a slim profile. This pack features dual horizontal gear straps and buckles for larger gear, E.V.A padded shoulder straps and 360 degree reservoir insulation. Features: Large Main Pocket with Pump Sleeve and Zippered Organizer Pocket and Key Clip, Dual Horizontal Gear Straps and Buckles for lager gear, Dedicated Zippered Reservoir Pocket on Back Panel, 360 Degree Reservoir Insulation, Soft Moisture Wicking Back Panel, Quick Access front mesh pocket, Silky Slider Sternum Strap, Removable Waist Belt, Reflective Light Loop, Tricot Specs: Weight: 16 oz, Gear Storage: 325 cu. in. (5.3 L), 100 oz (3L) Reversible Elite Reservoir, with Plug-N-Play and Quantum Clip. Measures 17.5″ x 7.25″ x 4.25″, 210D Baby Rip Nylon and 210D Nylon Construction, 420D HD Nylon Bottom Panel.