Long before they devised straps I had a duffel bag modified and dhad straps sewed on it at a place that makes sporting goods for pro ball teams. You could probablt take an old tree stand safety harnes strap system and make a set of carrying straps. Most of those stands are designed for the climber to nestle in to the stand and then just bungee them together. That stand may be a strongbuilt or a API baby grand or one of their other models.

http://www.outdoorsupply.com/gs2500.htm

http://www.outdoorsupply.com/gs2500ls.htm

Have you practiced with it climbing? You should before you go into the woods. It will help you do it more quietly and you will struggle/sweat less!