Large, top-load main compartment has a CD/MP3 player pocket with PVC headphone port. Zippered front accessory pocket, with key fob, is great for change, I.D. and other small items. Dual-side mesh water bottle pockets. Equipped with two 500ml BPA-Free Tritan shatter-resistant bottles. djustable compression straps secure gear. Durable waist belt, with webbing keepers, adjusts to fit waist sizes 24 to 55-Inch. Vapel mesh Airflow padded back panel wicks body moisture and provides superior comfort Contoured webbing daisy chain to attach a carabiner or other gear. Vapel mesh padded grab handle wicks hand moisture. Impact-and freeze-resistant hardware performs well in adverse conditions. Reflective accent piping provides added safety at night. Size: 9.0" x 8.5" x 4.5" Capacity: 215.0 cubic-Inch Weight: 1.75 lbs. Materials: Grid-Weave Duralite, Mini-Weave Duralite, 600-Denier Duralite