Our Paragon Hydration & Cargo Pack offers plenty of smart cargo space (25L) in addition to a 3L SOURCE Widepac™ Hydration System. Features ultra-light steel frame for maximum back ventilation. - See more at: http://sourceoutdoor.com/en/hydration-packs/128-paragon-hydration-pack.html#sthash.tNJuweFN.dpuf