I usually use the heavy duty cotton ones for day hunts or whenever I get a critter to the rig whole. They're heavy but can be used as a blanket if you spend an unplanned night out on the mountain.
For planned back pack hunts, I now use the Caribou bags and really like them. Really light and strong.
The Alaska bags and other cheaper disposables stretch way too much for me. Bugs and dirt go right through them. Pillow cases have never been big enough for a full elk quarter. For completely boned out meat I am sure they would be fine.
