This is a replica of the one shoulder bag used by the U.S. military. The front has a patch inspired by the National Aerospace Administration (NASA) to improve your casual mood. This patch can be removed with Velcro and can be changed. One shoulder strap for quick and convenient removal. The material is polyester canvas and the lining is waterproof, so it repels water and is resistant to stains. Features MOLLE compatible straps and small divider pockets for superior functionality. The back and shoulder straps are padded with urethane to protect your body. The main compartment has a double zipper closure and fully opens to the bottom for easy loading and removal.