I used to pack my ALICE pack full of junk when I went hunting. I'd be humping around 30 lbs worth of stuff "just in case." The last couple years I've left that stuff in the truck and decided to hunt light. In addition to weather appropriate clothing, I take my gun, a few extra rounds of ammo, my license/tag with a pen, my knife (actually I carry 2, one folding and one fixed blade), a basic 1st aid kit, my cell phone, a bottle of water and maybe a snack. The places I hunt I'm rarely more than a mile from my vehicle, so I leave a lot of the "extra" stuff there. I can always walk back to get it if I need it.
Mike