Top-load lumbar pack with two main compartments; one compartment has a key fob and D/MP3 player pocket with PVC headphone port. Adjustable/detachable shoulder strap. Dual-side mesh water bottle pockets. Equipped with two BPA-Free Tritan 500ml shatter-resistant bottles. Hinged front pocket adjusts to hold a helmet or other gear. Tuck-away waist belt, with webbing keepers, adjusts to fit waist sizes 24 to 55-Inch. Vapel mesh Airflow padded back panel and waist wings wick body moisture and provide superior comfort. Adjustable compression straps secure gear. Reflective loop holds bike LED blinker. Impact-and freeze-resistant hardware performs well in adverse conditions. Size: 12.0" x 9.5" x 3.0" Capacity: 550.0 cubic-Inch Weight: 2.35 lbs. Materials: Grid-Weave Duralite, Mini-Weave Duralite, 600-Denier Duralite