Abstract: The present invention relates to a waist bag and supporting harness comprising a pelvic belt, a diagonal shoulder strap, shoulder pad means, and underarm strap suitable for attaching to a conventional mail bag or similar bag. The harness restrains movement of the bag while in use, and inhibits posture deformation of the user. The harness of the present invention partially redistributes the load of such a bag or device, by providing a pelvic belt to take most of the weight of the bag, and reducing the weight supported by the shoulder strap. As well, the pelvic belt enhances the stability of a user's center of gravity by retaining the bag in a substantially constant position relative to the user's body while performing mobile duties.A shoulder pad and strap are restrained by an underarm strap to reduce stress in the neck muscles by preventing the pad and a strap from rising up on to the sensitive and vulnerable areas of the lower neck.