I took two caribou-size TAG bags on my sheep hunt. They let meat breathe very well in my opinion. I have no experience with kifaru bags. If they don't breathe, I don't plan to buy them. The TAG bags are a bit larger than needed, but they work very well and the material is light enough that you're not carrying too much extra.
Good tip on the drybag. My contractor bag liner was a bit leaky.
