I saw equipment that porters use in Africa to carry loads close to 100 lbs. Pieces of canvas and leather held together by patches. Straps are no wider than half an inch with no padding. Loads are big and troublesome: kitchen table, full kitchen stove... Not to mention what they wear: sandals/tennis shoes with some sweat pants to climb mountains that are 6000 meters. And on top of that they are still faster than tourists.