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I use the J107 its a decent pack. I have not packed meat with it yet but I have had some serious weight in it and its a nice comfy pack for me. I have a hard time finding packs that fit me well across the chest/torso and the J107 is pretty adjustable so I was able to get it comfy. The gun scabbard works really well. I use it as my day pack as well and its a bit heavy for that but I have the added assurance of the ability to open it up to haul meat should I get something of the beaten path...
I was looking at one (J107) as well but decided that I didn't need another back pack right at this point. Likely the one I'll go with when/if I weaken and have to purchase a new toy. The expandability and scabbard look like two great features to me.