I made this hook for water bottles and bags to give you a way to hang them from a belt loop, even if they don't have a way to clip on. I also made one for if your pants don't have belt loops. The one that is for the loops needs to be printed with supports, but the other one does not. Even at 15% infill, I was able to hang a backpack off of it, and obviously the more infill you use, the more weight it can hold. But then you get the problem of how much weight do you really want to have hanging from your pants.