I quit using a backpack for deer hunting years ago. I exclusively use a deluxe turkey vest. I modified a few of the pockets. Everything has its place - year after year. The large pocket in the back can be loaded up- even boned out deer! I have everything I need for almost every situation. As I climb a tree everything I need is in convenient reach; saw, pruners, extra steps, bow holders, twine, etc. I hang up the vest once tied in the stand. It distributes the weight over my back and shoulders too.
I can not imagine hunting without it. All I need to do is grab my bow, stand, and vest- I am gone.