The Tree Anchor weighs only 6 grams and cannot be lost because it is semi permanently attached to your straps. They are self adjusting. They make adjusting the strap up and down the tree a breeze. Also there is no occupant weight limit as long as it is used as intended and per the instructions.
copy and paste this link to see how easy they are to use https://www.youtube.com/watch?v=lhMnfn2lKZM