I hunt on 2 private ranches for the most part, neither have good cell phone coverage but I can text and get through so for health reasons a cell phone is at the top of the list{twice I've had kidney stones that completely incapacitated me within a couple of minutes}. Also I have tree stands at both which present a certain amount of risk for injury.
That being said as my cousin always said growing up, gun shells license knife, everything else is just a convenience.
But in addition to that my pack always has binoculars, range finder, reading glasses, toilet paper, calls,scents, flashlights, batteries, headlamps, extra ammunition usually in a magazine, a long cord, toilet paper, granola bars, folding saw, gloves, hot hands, two way radio, toilet paper, always have a handgun as well. Oh and I usually have toilet paper in my pack as well.
The list changes for archery hunting as one could imagine, it's warmer and sometimes I bring my dogs.
If I'm going to my little house I take a thermos of coffee and a 1lb propane bottle. Pretty handy when the temps get down around zero which is often here in november and december.