Depending on your torso length, you should look at the Mystery Ranch packs, too. Made in Montana, with many fans. Different designs than Kifaru, but equal quality. I wound up going with Crew Cab so I could pack out meat without making a mess.
You could burn a lot of time looking at pack discussions on the backpack hunting forum at 24hourcampfire.com. Lots of knowledge there.
If at all possible, borrow what you are considering, put 50-75 lbs in it, and walk for a few hours. Packs fit different people differently, like boots.
It's tempting to try to save some weight with a light pack, but if you're carrying meat it's a bad idea. A broken pack with a load of fresh meat 5-8 miles back is a bummer.