The cheesecloth bags are terrible. They don't keep the meat clean and the flies can lay eggs right through them. I've made bags from old sheets that work great. I've used pillow cases many times, but, depending on how you quarter and elk, they might be small. If you take the haunch or shoulder off the corpse, it'll fit. If you leave it attached to the spine/ribs/etc, it likely won't fit.

“In a time of deceit telling the truth is a revolutionary act.”
― George Orwell

It's not over when you lose. It's over when you quit.