The Colossus has a large lined interior that is easy to clean. Two zippered lined compartments roll up when not in use (one features grommets for ventilation). Zippered front accessory pocket. Elastic mesh side pocket with hook and loop closure. Water bottle pocket and D-ring hook on end. Pocket for portable music player with headphone port. Drop pocket for items such as sport goggles and sunglasses. Hidden backpack straps with Vapel mesh padding are stored behind bottom panel. Detachable, adjustable shoulder strap with Vapel mesh padding and suspension system. Neoprene handle wrap wicks away hand moisture. Vapel mesh grab handles on each end.