Large, top-load main compartment has 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 one 500ml BPA-Free Tritan shatter-resistant bottle. Adjustable side compression straps secure contents of pack. * Durable waist belt, with webbing keepers, adjusts to fit waist sizes 18 to 55-Inch. Reflective accent piping provides added safety at night. * Vapel mesh Airflow padded back panel wicks body moisture and provides superior comfort. Impact-and freeze-resistant hardware performs well in adverse conditions. Reflective loop holds a bike LED blinker