I would have been on at least a half dozen DIY backpack moose hunts if I hadn't already shot one and remind myself what an incredible PITA it is going to be to pack out a moose on my back.
I'm not afraid of working hard, but I think MANY people do not realize how BIG a moose is. If you are going to Alaska, you are going to have to shoot a MATURE moose as a Non-Resident; don't go look at a horse, go look at a Belgian or Clydesdale to see what you are going to have to pack. Also keep in mind many of the NR areas now require you to pack out the bones in the quarters along with the ribs. That is a lot of weight. One normal guy does not pick up a bone in mature moose hind quarter...Mike Mitten maybe, but he is a giant of a man with more drive and willpower than any 3 men I have ever met. Nothing about processing a moose is easy...the leather portion of their hide is as thick as your thumb is wide.
I had the luxury of horses to pack out my moose and I made a VERY INTELLIGENT mental note to NOT ever do this without that luxury :D With that said, I am currently researching a DIY trip for moose before that opportunity is taken away by the wolves and outfitters...
Here are a couple pictures, but I doubt they can convey the scope of work required to take care of and backpack out an Alaskan moose.
Packs I would choose for that job would be any Mystery Ranch based on the NICE frame, Kifaru Longhunter, Wilderness Wanderer, or Barneys.
DO NOT, DO NOT, DO NOT try to be cheap on your pack. You will be sorry!
When looking at the photos, keep in mind these are
BIG horses! That wrangler in the photo with the head was 6'5".