Osprey Raptor 4Advanced lumbar storage for the toughest MTB rides The Osprey Raptor 4 is Osprey's premium MTB hip pack, packed full of advanced features to comfortably add storage and hydration to your most challenging mountain bike adventures. The Raptor 4 has a 4-liter pack size, with a 1. 5-liter Osprey Hydraulics Reservoir, and a magnetic hydration hose bite valve that quickly and securely attaches to the hipbelt. The pack has an Air Scape back panel with a contouring lumbar wrap that increases pack stability on tough trails. The large zippered main compartment with an internal goggle pocket and key clip, dual zippered hipbelt pockets, and a stretch mesh front pocket let riders store whatever's needed for the most challenging rides. Features Premium MTB lumbar pack prioritizes comfort, convenience, and capability for all types of mountain bike ridesbluesign(R) approved to meet rigorous environmental and social sustainability standards Air Scape back panel with a contouring lumbar wrap for increased pack stability Includes Osprey Hydraulics 1. 5-liter Lumbar Reservoir with a magnetic hipbelt bite valve attachment Internal goggle pocket and key clip for secure, safe storage of goggles and valuables Lid Lok bike helmet attachment lets riders safely stow their helmets Looking for a women's-specific fit? check out the Osprey Raven 4!Specifications Weight1. 08 lbs Total Pack Volume4-liter | Osprey | Raptor 4 | Black | Os Hydration Pack