Energy bars, and MREs and wish I could find some C-rations… .miss them… Yes I am strange.
Fire Starters, extra clothes, jackets, ponchos, tarps, even trash bags for ground cloth, shelter, and foul weather, and tools for fishing, hunting, and some foraging. Plus ammo.
Ability to boil water, filter water, and first aid equipment.
Enough to survive, while not in luxury… survive.
There is a difference between a BOB and a GHB (Get Home Bag) which might help you return home, to safety or to grab your BOB… still, fire starters, tarp, trash bags, and ammo.
Always have a good knife, a thick bladed knife in any BOB or GHB. A knife helps with building a shelter, gathering wood, batoning and may even be used for detail work, though a smaller pocket knife for detail work would be better. Always have a means of starting fire, or two. Matches in a water proof container, and some other fire starter. A means of obtaining water, or boiling water, keep a stainless steel canteen and canteen cup, or a steel camp pot to boil water. Trash bags (can be used as a poncho to keep rain off, or as a ground cover for sleeping, and a tarp, can be used as a tent, or ground cover or a means to drag wood or other items, or an injured companion. 550 cord.
Matches and alternate fire starter
Camp cooking pot, or canteen cup.
Fishing hooks, and some line. (small fishing container with some hooks, line, weights)
Energy bars, MREs, and or some freeze dried (remember, freeze dried requires water, so it helps to have a nearby water supply)
And water, or a means of filtering and purifying.
Medications you require.
If you have room and can add.
Warm Jacket ( should already have this if the season dictates a jacket)
There are several things you can add, but primarily after these listed, whatever your region might require that is different than others… such as medical kit for scorpions, Ice / Climbers axe, goggles if there are serious dust storms, generally whatever is unique for your area… but this should help you survive.
Try not to make it too heavy, but ensure you can survive, and know what each item you carry does.
Remember … Pine Needles make a good healthy tea
And DO NOT forage mushrooms unless you really know what you are doing.