How much weight are you planning on carrying? How much volume is needed?

Hauling meat?

I like my Kifaru Mtn Warrior and Duplex frame. Does everything I can imagine I'll need out of a pack.

Hill People Gear makes some really nice stuff as well. I have a couple of their smaller bags, but haven't tried their bigger offerings.

I have no experience with SG or MR, but they're probably on par with the above for durability.

Where are you located in VA?