Abstract: A backpack or back borne load carrier system with abdominal support, providing both internal and external modes of back borne load support to increase an individual's load bearing capacity. An abdominal support pad and pelvic belt system is attached to a conventional backpack or equivalent load carrier system equipped with shoulder straps, to cause a portion of the load weight that would otherwise be supported directly by the shoulders and spinal column to be transferred to the pelvic region for additional external support, and to the abdominal trunk region for additional internal support through enhancement of the natural hydraulic muscle action of the abdomen in support of the loaded spinal column.