I use a good quality student size backpack. Contents are: toilet paper, a few paper towels, a small pack of handy wipes, knife, compas, matches or disposable lighter, string or cord, a few rounds of ammo, knife, compas, binocular (if not around my neck), water, snacks (usually nuts and apple), surgical gloves, scissors, small bug repellent, a few band-aids, sunscreen, a few plastic bags, and perhaps some things I have forgotten. There may be a small radio with ear buds if I'm going to sit in a "luxury Texas tower." Football games still happen!
Additionally, I will have duct tape in my hunting vehicle, and perhaps in the pack. We were once chasing scaled quail in the desert. Our driver ran over a small mesquite and a broken branch pierced the oil filter. I cleaned the filter, sealed the hole with duct tape, added a quart of oil, and the hunt was back on. Good thing, civilization was a good 8-10 miles away and we had a couple of seniors aboard. We made it to a mine where the shop gave us an oil change and a new filter. West Texas Hospitality!
Note that we are not talking Costco size rolls of toilet paper or quart size bug spray and sunscreen. 2 - 2 1/2" of TP still on the roll is plenty, then mash it flat to save space. A 2 or 3 oz tube/bottle of sun and bug protection is enough.
Good hunting,
Jack