Food/water
Toilet paper
Kill kit appropriate for whatever species I'm hunting
Flashlight
Spare bowstring and shooting glove
License/hunters ed card/permit if needed
Anything else will be dependent on season, topography, and weather. If I'm a 15 minute walk from the truck which is 30 minutes out of town, there's no precipitation, temps and winds are stable, and I'm chasing a little ole whitetail or squirrels then I'm not lugging around ANYTHING else extra. If I'm backpacking in 2-3 days from the trailhead into a wilderness location that's several hours from the nearest hospital by car in ideal conditions...well I'm likely to have some communication, fire making, spare clothing, first aid kit, shelter, etc.