Hiking sports hydration pack with bladder,cycling hydration pack,hiking pack HP108 Material:nylon,Weight:21.2 oz,Dimensions:16.9x7.9x5.9inches Fits 2L Bladder( included),Thick mesh pads allow air flow to back High density foam stabilizer with ventilation holes and mesh covering add comfort and breathability to shoulder straps Full-length main pocket with weather guard and hidden zipper Over 800 cubic inch capacity for full-day or overnight trips