If you have the cash and want the best go with Kifaru or Stone Glacier. I looked in detail at Kuiu and guys that pack ultra loads weren't too terribly excited. I'd suggest a 6,000 cu in bag or larger. You can always cinch down a smaller load with a large bag but if you don't have enough room with a small bag you will likely need to do an additional trip or a super awkward load. Kifaru offers camo while Stone Glacier does not...a game changer for me since I hunt with a pack on my back and prefer camo. Kifaru owners rave about the comfort of the belt and frame when hauling extreme loads. Kifaru also offers a gob of different bags, pouches, lids, etc. so you can customize your bag. SG is a little lighter weight and offers the ability to place meat between the bag and frame. I have no problem packing boned meat in my bag.