You can get a good new backpacking pack that'll work for the price of a used hunting specific pack. Osprey is probably the best and I'd recommend the Aether. Doesn't have quite the load support of a hunting specific pack, but it's designed more for heavy loads than ultralight stuff. A friend of mine uses his elk hunting and it gets the job done. Looks like they are on sale right now too...
I agree with this if it's not 100% focused on meat hauling.
The 'hunting focused' packs that can accomodate multi-day trips AND haul meat efficiently are expensive for a reason
P.S. I just cleaned up a 2015/16 Eberlestock Team Elk M5 (https://eberlestock.com/collections/hunting-packs/products/team-elk-pack) this weekend to sell it as I upgraded to the MR Metcalf. You're free to PM me about it if you want, it can handle a couple nights' spike camp and still have meat hauling capability but more than 2 nights would be a stretch at ~3000ci capacity