I walk a couple of miles into the woods to get to the deer on public land. I carry a small pack. In it at all times are a flashlight, compass, rope, TP, and some plastic bags. I also have a GPS unit and my phone even though I need to be on the road for the phone to have reception.
I carry two mags and 6-8 more rounds for my gun. Not certain why the extra rounds, I've never even fired a full mag hunting in over a decade so the spare clip really is enough.
I also carry food and water.
In the gun season I add hand warmers, hand pouch (hand warmer for my shooting hand), radio, and a small camera.
When you walk two miles or more back into the woods, you pack for the long haul of the day. You enter the woods in pitch black, and are not coming out until the light is gone. That is unless you are bringing out a deer, or are sick.