As someone who’s tried, and failed, and tried again to do exactly what you’re proposing, let me make one simple statement: It’s simply impossible.
You have to accept that, at some point, you’re not going to have something you need.
Let’s start simple: A screwdriver. You can do a lot with a screwdriver, so let’s have one in there. Not only useful for removing and replacing screws, of course, but you can pry with it, you can poke stuff with it, you can point it at things, plenty of other uses if you’re clever. But… what if you actually need it to remove a screw… and it’s entirely the wrong size?
You need a minimum of two screwdrivers, anyway, if you’re gonna have any at all. And you need different sizes, too. An eyeglass screwdriver isn’t gonna do you much good under the hood of a truck, and vice-versa. So you need a screwdriver KIT.
Plus other tools… wrench, pliers, hammer, this, that, the other thing… before long ya look like Tim the Tool Guy. And THAT’s just to do, ya know, mechanical stuff.
So ya compromise. Ya really can’t do much with a hammer other than have it, ya know, a hammer… but you CAN get something like a Leatherman (as mentioned above) that has BOTH screwdrivers, PLUS a knife, PLUS a file, plus a bunch of other useful stuff. Excellent… you can almost carry that (and the hammer) without looking like a moron.
But there’s tons of other stuff to do, isn’t there? And if you try to cover EVERY possible activity, every possible thing you might possibly want to ever do, yer screwed. That’s a LOT of stuff, no matter how compact it might be.
A knife. A leather jacket. Good sturdy boots. Anything else ya need, you’re gonna have to get where you are, or do without.
If you’re lucky enough to have some advance notice of the situation… climate, civilization or lack thereof, technology level, valuable commodities for trade… then prepare specifically for that. Anything else, and you’re not just wasting time, you’re probably hindering yourself.
Zebra, your list seems awfully familiar… cold war era movie perhaps? One of the Bond films? Been ages since I’ve watched those. Your list is, in general, pretty darn good but it’s obviously russia-biased. Most of it wouldn’t do you much good in downtown Mexico City, or the middle of the Brazillian Rainforests.
A knife would. But your gun would beat it until it ran out of bullets.
Your mind is your most powerful, and versatile, tool. Remember that for every item you might put on your list, someone somewhere had to be the first to need (and make) one.
Oh, and vial of holy water, in case of zombie attack. Because you never know.