I used an Alaska frame for years when I first started hunting. It worked but was super uncomfortable and difficult to pack hefty loads. After ending up up-side-down like a turtle on my back on a steep hillside I decided there had to be something better...and safer! One thing you will notice is a heavy load is so distant from your back that if you are hauling much weight on sidehills you will constantly be fighting the frame. A properly fit framed pack (similar to Kifaru) will fit fairly comfortable and tight to your back.
About 15 years ago I ended up getting an Arcteryx Bora 90 for packing hefty loads. I hauled out my fair share of elk, deer, moose, mtn goats, sheep, etc with it. It had a large bag that was big enough for hauling fairly hefty, bulky loads. I really liked the load lifters on it. You can likely pick up a nearly new one on Craigslist or Ebay for around $100. I used and abused my Arcteryx for 15 years...and it still is in decent shape.
Once you seriously get into hunting and hauling game you might consider Kifaru or Stone Glacier. They are expensive but well worth the money. The thing I like about Kifaru is once you have a frame you can buy several bags. I have 1 bag that I use for shorter day hunts and a 2nd bag that I use for hauling hefty loads. I use the larger one for multiday elk, sheep, and mtn goat hunts. It's nice having a bag that is large enough for camp, meat, plus cape. For larger game it will likely save you several trips hauling out boned meat!
