I use a mystery ranch crew cab and really like it. It will haul more than I care to put in it and with the NICE frame you can buy different bags for it as well. Packs are like everything else in my opinion you can never have too many.
I much prefer the external pack frames for hauling out meat over the internal frames. We hunt with a small day pack with the essentials and then go back in with the pack frames to haul the meat out. Two guys can get out an average elk in one trip if you de-bone it.