My typical pack for a single day of hunting close to home (like you'd be doing in Oklahoma) is weather appropriate clothing and boots. An orange vest. My vest has pockets and a game pouch in the back. I use this in place of a backpack.
It is obvious to say that you need your license, your firearm/bullets or bow/arrows/broad heads etc. This doesn't need to be pointed out. Especially to an educated man as yourself.
Aside from clothing and weapon of choice. I carry a sharp pocket knife a drag rope, a small pair of binoculars, a water bottle (usually two), and some snackies.
Don't overcomplicate it.
-Jake