There's enough Grizzlies where I hunt that I'm more then happy to not smell like injured prey.
I made a good size DCF stuff sac that is waterproof, weighs less then an ounce. My sleep setup normally lives in it. But when I'm packing an animal the meat filled game bag goes into the DCF stuff sac and bag stays clean. As soon as the packing is done, the game bag comes out of the DCF bag.
I dont buy into the concern of potentially losing meat if it is in a waterproof bag for 2-8 hours. Its hanging in a game bag before/after the packout, so can breathe and cool fine. An animal shot and left over night has a heck of alot more time to spoil then being packed into a backpack.... my opinion might change if it was over 80, but I'm rarely packing meat in anything warmer then 65 degree and often cooler.