This invention is a back support system designed to reduce the stress exerted on the back of a wearer when he bends over to lift a load. This back support system comprises a harness and a yoke for distributing the load on the shoulder of the wearer. The back support also comprises a tension system equipped with elastic cables. The back support further comprises leggings including straps designed to wrap around the sole of the wearer and to maintain the force acting on the leg as close as possible to the bone structure of the leg of the wearer, thereby relieving stress on his back and along his legs.