BLACKHAWK! StingRay Hydration Pack Made of 500 denier CORDURA ripstop nylon for extreme durability Includes the 100 oz. BLACKHAWK! Hydration System that is protected by Microban antimicrobial treatment Bite Me bite valve and patent-pending quick-disconnect system Over 50 S.T.R.I.K.E. attachment points on back, sides, and waist belt 1900 cu. in. / 32 L