I carry a small plastic case that has most sizes in 1/4".
A couple vice grips
One crescent wrench
a full roll of gorilla tape
a couple rubber gloves (these have been very helpful over the years, not just for wearing) They make good gaskets, plugs,straps,etc.
bailing wire
And I always have my dewalt impact with charged batteries in the trunk. That case has been invaluable over the years.
It has 3/8 sockets, screws, a few drill bits, magnet, random small tools.
OH, and a gun. Special tools for special reasons.
Here in rural Colorado if I get broken down, I could be there a looong time. no phone service in most places out here in the mountains.
I didn't mention that I always have a beanie hat, carhart thermal overalls, and an extra carhart jacket.
All this fits into two small bags.