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The 'Up-Drop' technically been designed to carry loads of water up-hill and down-hill. The people living in the hills are not involved in physical activities every day, making their muscles weak. Still, the activities they do have to do it at certain intervals, including lifting.Up-drop eases the load's pressure on the back. It minimizes the gravitational force effect by the spring mechanism, which raises the bag upwards in sync with the torso's movement.