I prefer a pack that can function both as a day pack and a meat hauler. An internal frame pack can do that. For the money, I really like the Eberlestock packs, not just because I sell them, but because they work ideally for the way that I hunt elk. I don't want to have to hike back to camp or the truck to get frame to haul meat.
For day hunts the Eberlestock X2 is ideal. Small enough to be a perfect day pack, and strong enough to haul meat. You'll find lots of good reviews from plenty of people that have used them.
For extended overnight bivy type hunts, the Eberlestock Blue Widow is a great pack. Plenty of room for everything you need for extended stays, and compacts down small enough to hunt with daily.
You can check them out on my website below and also on the Eberlestock link posted above for more details.