Make or buy something that is stout enough to hold a rear quarter. So the test is, (a) load a rear elk quarter into the bag, (b) tie off the mouth of the bag with a piece of rope, (c) holding the bag around the gathered portion of cloth, lift up the rear elk quarter. Does the cloth bag hold the rear elk quarter or does it rip out? If you don't feel confident in the strength of your cloth in this test, you better use heavier cloth. My rear quarters on my 4x3 elk weighed 53 LBS. This was a small bull elk, maybe in the 450 LBS range. I would guess this rear quarter could range up to 75 LBS pretty easily. So your bag ought to hold 75 LBS of meat without ripping. I'm willing to pay to buy the commercial game bags also. Still, this seems like a nice do-it-yourself kind of project if you have a mind to do that. Also, make the bag amply sized.