I hunt in a lot of hard wood trees. I have tried some of the cheap walmart hangers but they wont srew in oaks. I saw some were on hear a bow holder that straps around the tree with a sinch strap but I can't find it again. Also I would like to hang my back pack to. Let me know if any of you found any bow holders that will screw into oak or some other system you use that works to hold a bow and your pack thanks.