High Sierra Solo Hydration Pack Low-profile main compartment has a key fob and CD/MP3 player pocket with PVC headphone grommet. Equipped with one 500ml GE Lexan shatter-resistant bottle. Adjustable side compression straps secure contents of pack. Contoured webbing daisy chain to attach a carabiner or other gear. Vapel mesh Airflow padded back panel wicks body moisture and provides superior comfort. Durable waist belt, with webbing keepers, adjusts to fit waist sizes 18 to 55-Inch. Reflective accent piping provides added safety at night. Size: 17.0" x 8.0" x 3.5" Capacity: 153.0 cubic-Inch Weight: 1.32 lbs. Materials: Grid-Weave Duralite, 600-Denier Duralite