Rugged 600 D grid ripstop fabric. Fully adjustable waist strap with quick release buckle. Main compartment with quick release buckle. Waist strap tucks full into back to be worn as back pack with removable shoulder straps (included). Zippered main compartment with inside MP3 pocket. Headphone access hole. Front zip compartment. Padded side zip compartment with quick release buckle. Side water bottle holder with tightening pull cord and quick release buckle. 2 side zip pockets on waist straps. 15" W x 7" H x 8" D