^^^^ This^^^^. I don't know what people carry to say that the load in the bag is going to pull you backwards if you have meat in the shelf. Yes, a rifle or bow strapped to a bag sandwiching meat will screw with the balance of the pack. But, unless you are bringing a size-able amount of Spike camp or a bivy camp out with a load of meat, this theory is mostly fireside logic. Day hunt gear isn't going to affect you that bad strapped over a loaded meat shelf with properly packed meat.
I've done it both ways with multiple pack frames and bags. And, I much prefer the shelf. I imagine these great big bags would hold a whole deboned elk. We are talking a lot of weight. Regardless of the internet persona present on hunting forums, it is just too heavy to feel the bag up and carry out for most common folk. I think people forget that when they advise you of their load outs. Its like guys saying they packed out their bull in 5 loads. All 5 loads were over 90 pounds. SMH