Mercury Tactical Gear Code Alpha TAC PAC Expandable 3-Day Backpack with Hydrapak 3L Hydration System, Air Force Digital Camouflage 600 Denier polyester construction with vinyl backing with 100 oz. Hydrapak Hydration System Large expandable main packing compartment, organizer pocket, and side parachute clasps Easy-grip zipper pulls and back support belt with parachute clasps MOLLE loops with Hook and Loop for Pride Patches and name tapes Padded back, shoulder and waist straps with sternums trap for comfortable carry