Last year in Montana, I packed out 2 mule deer with my buddy. He had the Kuiu Icon 1850 (using his load sling), and I had an Eberlestock pack, not quite sure how many cubic inches, but we got both deer out in one trip. If you and your partner both have packs in the 3000 cubic inch range, you should be just fine. Especially if you have the capability to attach random gear to the outside with straps or whatever. A boned out mule deer isn't all that much weight to carry. A friend of mine carried an entire deer out alone using a stone glacier 6000ish pack. But with two guys, it's not too bad.