The rugged pack cloth CRS pack can be worn as a single shoulder Sling pack or as a backpack by simply opening the central zipper on the shoulder strap to create two backpack straps The pack also features interior zippered mesh pouch and one large pouch for hydration bladder or laptop computer There are two exterior zippered pouches and two zippered trail snack pouches on the waist band lots of PALS strapping both on the inside and outside for adding modular pouches