Abstract: A bag structure particularly adapted for carrying a heavy load, such as mail and the like, at the waist to either side of the body. The bag includes a mail container constructed of a heavy, wear-resistant material such as, for example, canvas. The bag has a front wall, a back wall spaced from the front wall, spaced apart end walls interconnecting the front and back walls, a floor, and an open top. A belt is adapted to be attached to the mail container and releasably wrap around the waist of a person to carry the container. A belt loop device is located at the back wall of the container for removably attaching the belt to the exterior surface of the container back wall.