Free: Contests & Raffles.
If the Osprey works for you, I see no reason to buy another pack.
Just pick up a lightweight liner bag from Sea to Summit to put your meat in so you don't bloody the pack up.
I think the most important reason for using a pack made for hunting is that they are made to be quiet. Maybe your style of hunting doesn't require a quiet pack. And if that's the case you probably don't need the camouflage color either.