Dear student,
Usually potters carry the load on their shoulders or head as this will enable easy movement with heavy load than carrying them in the hands.Porters place a thick ,round piece of cloth on their heads when they have to carry heavy loads of passengers.By placing the thick, round piece of cloth, the porters increase the area of contact of the load with their head.Since the load now falls on a larger area of head ,the pressure on head is reduced (as pressure is force/area, when area increases, pressure decreases)and it becomes easier to carry the heavy load.
thank you