Trying out multiple packs is definitely sage advice. I carried an Exo for a day and knew immediately it wasn't for me. The Kifaru platform was much mor comfortable and the fact that the pack and frame are separate so you can stuff meat or a duffle in between just makes sense to me. I didn't have acces to an MR or Hill People Gear bag, so I couldn't test them. The other thing you should do is call the company you're interested in. The guys at Kifaru are all hardcore hunters, most of em with a bow and a handful with a trad bow. They use and know their gear. I would expect the same from MR or HPG. They should be able to guide you in what pack and frame will suit your hunting style.
I also like the modular approach to Kifaru gear. I can have multiple bags for the same frame to suit different situations and I can load it up with pockets and a lid or slim it down to bare bones and use it for shed hunting. Even though it isn't ultralight, it has replaced my ultralight backpacking pack. These packs also hold their resale value like a well made trad bow. If you end up with something you don't like, you can get most of your money back out of it. This also means you can pick up pockets, pouches and even different bags from some other classifieds.
Thanks for the elk comliment. Yes pictures removed due to the technology shown, which I understand. Pm me if you have any further in depth questions.
Cheers,
DJ