Must have is kind of hard… when I find something that I don’t use regularly I, usually, remove it from the kit.
My always gonna have camping list not including things that I carry every day every where;
Tent with ground tarp,
toilet paper & either an e-tool (one in each vehicle) for cat holes or a porta-pottie,
food, munchies, potable water, soda and beer,
a canteen (typically 1 of 3)
a cooler with ice, or the portable fridge,
either paper or non-disposeable plates,
the collapsible trash can with bags
Grubbin’ tools (stainless knife, fork, spoon, can opener, bottle opener),
cot w/pad, head board, pillow, stocking cap, and sleeping bag,
spare clothing,a jacket, and rain jacket,
a chair (for me) and a spare for a visitor (typically 2 of 3),
A deep discharge, 12 volt, tent battery, inverter and LED ceiling light (with cord),
a folding camp table (typically 1 of 3),
personal cleanliness items (tooth brush & paste, soap, wash cloth, razor, wash basin, towel, comb),
fire starter, usually a BIC lighter (typically 1 of 4)
there is a trauma capable first aid kit in each vehicle, & the condition of my knees prevents me from going far…
a long lasting flashlight,
I have probably forgotten some things, but I think that covers most of the stuff.
I don’t cook much anymore so I don’t bring many tools for it (or cleaning up afterward).
There are a few things like the door bell and solar porch lights that don’t matter much but can be conversation items, packed in the cases…
If the trip is going to be longer than a week, solar panels to recharge the tent battery are usually included.
Enjoy!