I use the same synthetic game bags I use for elk (TAG bags).
They breathe, allowing the quarters to develop that nice dry exterior crust, which is what protects it from bacteria and fungal growth. Also aids in evaporative cooling.
When done you throw them in the washing machine and they are good to go for another use. My set has packed an elk and a dozen or so deer and they are still going strong except one that I tore being careless.
I guess you could slum it with trash bags for a short pack out, honestly I’ve never tried, but the consensus is that they are basically a greenhouse, retaining heat and moisture. You absolutely want to do the opposite of both those things.
Pillowcases I guess are better than trashbags, but just why even go there? Good synth game bags really aren’t that expensive these days in the scheme of things.
Yeah it’s not a half-ton beast, but it still takes me a few hours to get a deer out sometimes. I sometimes hunt deeper in here than I do for elk out west. My normal process in warmer weather, after I kill, I get down and I quarter and hang those quarters asap, pack my gear out and return with a heftier backpack to pack the meat out. That’s a good hour or three that bugs can get on my meat if not protected, and I want to get the fastest start on cooling that meat I possibly can. Cold weather, 30’s -mid 40’s, obviously you can be pretty leisurely about it then and the bugs are usually gone by that point as well.
I take my meat care very seriously. From the time I let an arrow fly until it is in the freezer, I am doing every little step within my power to take optimal care of that meat. I am pretty anal about it. I enjoy grade A gourmet venison, not eau de funk with a hint of glad trashbag essence. I don’t really understand skimping or cutting corners in that department.