I use pillow cases for game bags and bone out the animal. A small tarp or piece of plastic allows you to lay the meat out to cool as you are boning out. The load in the pack goes into a plastic bag for the pack out and then out of the bag into a cool place (still in the pillow case) with good circulation. If your not too far from a road that allows motorized vehicles, then you can pack the quarters bone in and hide on if you so wish. Very far and you will find boning it out to get rid of excess weight can save a trip and some wear and tear on your body. The quality of pack counts for something. Make sure it fits you correctly and that you can cinch it up right. It makes a huge difference.