Order of priority in pack shopping:
1. Fit. How does the pack ride with 65-80lbs in it? Is the belt on the pelvic girdle? Are load lifters working? Are shoulder straps right length?
2. See #1
3. Durability. Will it hold up to the aforementioned 65-80lb loads ALL THE TIME? Backcountry pack repair sucks. Bad.
4.Organization/Size. Will it hold what you want how you want it? This is often a personal preference, but remember loading is critical in a pack depending on uphills/downhill etc.
5. Price/use value. Will this be a once week, once a month or once a year pack? How many miles will you put on it?
I'm not even going to comment on how low down the list colour should be when buying a serious pack for hunting.
Brands? Arc'Teryx, Dana, Mountainsmith, Gregory and even some of the REI in house are great. Kifaru, Mystery Ranch, Eberlestock if camo floats your boat...
If you do not know how to size a pack, spend the time and get it done properly, and make sure the pack fits. Boots and packs are no places to cut corners.