Where people get into trouble here in Idaho elk hunting is carrying so much stuff that when they do get onto elk- they literally kill or injure themselves.
I bow down three times a day in the direction of where Elknut lives- I like his list- and how light it is.
This is not when you want to carry 60 pounds on your back while hunting!
I carry a small water filter on me- I can fill up a water container and drink any water through the filter- or sip straight from a creek.
I keep it in a pocket - so its always there.
Dehydration is a killer. Most hunters are used to high humidity - here it might be single digit - and it may be in the 90s on the last day of the hunt.
Think of your blood as thick as water; well after few hours of hiking ( and seeing an elk or hearing one bugling- or both: will put you into hyper-gear) it will be like syrup.
Drink all you can when you can- if your not sweating; you can write your name in the dirt.
I have seen people drink a gallon in a few minutes. That is dangerous too - but - you will be motivated.
I often hunt from my cabin; and I carry the water filter; a 'space blanket'; a lighter; a file; my knife on my belt; and my skinning knife; my wallet with my ~license and tags~ and a flashlight.
Way to many times I have seen people start out with enough stuff to last for days; in a heavy backpack; that after the third or forth day- gets left behind.
of course- that will be the day you need something in it.. that is why I take the minimum in my pockets.
And really - really - really- if you have never spent the night in the woods unprepared- stay the night in your backyard and test your mettle.
Patrick McManus suggesting perfecting 'MSP' [modified stationary panic] if you get lost; you put all your stuff on the ground; take a step to the side and jump up and down and scream and when your all done and exhausted - your no more lost than when you started. And your gear is right there.
If you have a few essentials in your pocket- well it will be there when you realize: you forgot where you put your backpack down.
Nothing more exciting or demanding than elk hunting. Be prepared