Poor selection can bite you in the ass and it depends on the kind of hunting you do. I use a large day pack that I can break down boned out animals into to save me carrying the animal separately. I find hunting packs to be more generous with pockets than camping or trekking packs. I like that because if I'm looking for my rangefinder I want to get to it fast and not dig through mountains of shit to get to it.
Here's what I run
http://www.badlandspacks.com/gear/packs/sacrifice-ls-bsacappr