Black and Mild cigars. I’m not much of a smoker, but they keep the bugs at bay when gutting.
Fruit flavored tootsie rolls. I stash a few here and there. They cut the dust and dry mouth if you run out of water, and their wax paper wrappers are good fire starters.
A small headlamp like the petzl zipka. This works as a headlamp or task light, but also really comes through in red-flash mode to help you find a downed animal you are packing out in the dark. Just set it to flash, put it at eye level and facing your angle of approach, and it is way easier to make that second trip in the dark.
I also carry some of my Dad’s ashes. On every hunt. He developed my love for the sport, it’s the least I can do.