Lets hear some interesting backpack "must have's"........Go!

Beer, TP, Snuff

Beer, flashlight, TP

Flashlight, extra ammo, knife, water

Flashlight,extra batteries, extra bullets, Toilet paper, and ( if im hunting with a friend, a walkie talkie).
Cover scent, Rain jacket, hoodie.

And a first aid kit.

Rope, grunt call, bleat call, snacks, ear plugs, hand wipes, Tinks, plus what everything above. No beer just coffee.

I also got the Primos Can, Ear plugs, Buck Bomb, Grunt call.

Tinks doe urine works G O O D! Have you tried there smokin stick?

Some of the above but also an electronic caller. Rifle prop. Machete and thermacel

I have way too much but feel I need everything. Thermacell headlamp flashlight compass 2 survival blankets lighter and waterproof matches moanocular 1 contractor bag 2 skinning knives small camo umbrella pen and wire tie gloves for skinning game

Bogon, gloves, parka, mesh mask, face paint, large choke chain, 2 knives, sharpening stone,pliers, rope, snacks, $5 bill, copy of current years hunting guide, zip ties, pens, rubber gloves, first aid kit, range finder, binos, TP, hand warmers and Koozie for Coke Zero,

Wipes, bright tape, batteries, 550 cord, bug spray, water, sling shot, plastic disposable gloves, binos, first aid items, range finder, extra (light) jacket, knives, and usually an adult beverage or two.

No beer, definitely some TP and a garden trowel, a knife, small binoculars, spare batteries, nitrile gloves, a whistle, hunting license, waterproof matches and a couple of pieces of candle, some parachute cord or equivalent.

Don't carry all of this all the time but taylor contents to task at hand.
Use a full sized backpack with MOLE attachment points or a shoulder pack or a fanny pack depending on where/how long.

A couple of 55 gallon trash bags - don't take up much room and comes in handy sometimes - makes dandy emergency rain parka/gun cover!
NV monocular and illuminator.
Binos
Extra IR illuminator for digital NV (if needed).
DVR, cable and remote.
Cutter natural insect repellent and/or an OFF battery powered repeller for stand use.
Snacks: PBJ sammich, cashews, butterfinger or baby ruth, V8 and crackers, etc.
2-3 bottles of water and a gatorade - if I'm stand hunting, the gatorade bottle makes a fine urinal.
Extra gloves(warm and rubber), dark hoodie, stocking hat.
AA and AAA batteries for NV and 18650 for flashlight and flashlight.
Extra mag loaded with 9 120gr SSTs.
1911 w/extra mag.

Many of the things listed above.
I have a 5 foot square of fluorescent orange nylon cloth. I hunt in camouflage and if I get hurt or need to be seen I can whip it out. I used while coyote hunting and I called in bird hunters, a quick flash of the orange, they gave a wave and went away.

M

TP, headlamp, penlight, cedar scent, turkey slate, bread ties and ink pen, knife with gut blade, butt-out, a book, snacks, water, and a small box with 2 rounds each of .22 Mag, .223, 30-30 and .308. I've never needed, but if I ever forget ammo for my primary hunting weapons, I can hunt, but need to make the rounds count. And all but the 30-30 become single shots!

Socks
Spotlight
Water
Extra batteries for thermal
Extra ammo