Back System: AEROSHAPE CORE Waist Belt: Webbing, Detachable RAINCOVER Inside Inside Pocket: 1 Key Hook Prepared For HYDRATION SYSTEM Reflection Measurements: 44 x 26 x 18 cm Weight: 590g Capacity: 12 Lit. The VELOCITY 12 pack is a hydration-system-ready pack with enough storage for all-day adventures. Built on the AEROSHAPE CORE back system for breathable comfort, with an integrated rain cover and removeable waist strap.