The Maxpedition DevilDog is a spacious buttpack equipped with pouches on both sides for carrying one-liter Nalgene bottles. The main compartment opens to reveal 500 cubic inches of space with heavy-duty internal organizers in the front and back of the compartment. An internal snap retains keys or a pair of gloves, while the padded, 2-inch belt strap with quick release can be concealed inside. The DevilDog Versipack comes with an additional adjustable 1 1/2-inch shoulder strap with removable shoulder pad. Nylon attachment points in front and on the side allow for modular attachment of more Maxpedition accessories. The breathable sandwich backing allows for comfortable wear during extended periods of activity.