The heaviest harness and the lightest harness I have weighed only differed by about 3.5 pounds. For most of us that is a negligible difference. If you are packing in a lot of gear a long distance, a rock climbing harness will likely be the lightest option. However, once you consider the weight of a portable stand plus your harness, a tree saddle will cut down on your total weight overall and likely be the lightest option.