I think there’s a fine line between necessity and the weight of your pack and gun and the impact it has in your ability to get out of a place and maintain your energy levels. I hunt canyon land so my pack usually consists of:

-binoculars
-first aid kit
-knife
-paracord/compass
-fire starter
-deer call
-head lamp/flash light (hand crank kind with a usb charger)
-chapstick and dude wipes
-zip ties & pen
-one small foldable space blanket
-balaclava & gloves/beanie
-water pouch/camel pack
-toilet paper
-hand warmers
-Small radio

Everything else I’m carrying on person (wallet,phone,gun, gun stick)

Paracord, zip ties, marking tape, fire kit, first aid kit, knife, headlamp, TP, compass. Usually a couple of snack bars and a bottle of water.

If I'm going to be field-dressing/quartering, I make these kits out of a folded gallon bag that includes two pairs of the thicker surgical gloves, folded blue paper towels, a folded contractor grade 55 gallon trash bag (to use as a quick tarp and keep meat clean) and a small pack of anti-bacterial wipes. I keep these ready to go in my hunting box so it's easy to grab a pre-made kit and just shove it in the bottom of my backpack where they don't take up any space.

If I'm hunting more remote, I will add water filtration and iodine tablets, a bigger first aid kit.

These lists don't include camping gear or clothes.