I have used several MR packs, and although they are extremely rugged and durable, they are heavy, and the running joke with my sheep hunting buddies is to call them Misery Ranch, because they can be pretty uncomfortable when loaded, I would suggest you check out Kifaru's line, they are also very durable, and the most comfortable pack I've ever worn, even when loaded heavy. The one I currently use is the prototype timberline (full size pack), I've taken it on 2 sheep hunts, and 2 goat hunts and it's holding up great!