I agree with .284. If you can save for an internal frame pack, do it. Mystery Ranch are very good packs along with a number of other brands.
The Cabela's Alaskan will do what you want it too but the suspension isn't the best and the weight is held out away from your body. The problem with this occurs when you are packing a large load off trail. That weight shifting can cause a loss of balance and a fall.
The store on this site carries Eberlestock packs. I don't have any first hand experience with them but have seen some good reviews. You can pick up Blacks Creek packs at a deep discount this time of year (if they interest you, PM me and I'll tell you where to shop). They are decent packs with an adjustable fit. If you have the money, Kifaru packs will do everything you want and more. I would also look at Nimrod packs.
Another option is to look for one of the older Gregory Pro series packs on eBay. Look for the Denali or Robson Pro. Check out the Gregory website and follow their fit instructions to see what size you need. Either of these packs are around 7000 cubic inches and will haul a load.
Almost all of my hunting is done by backpack in Western Montana and Idaho.
