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A good multitool or Swiss Army Knife.
Mine was gifted to me a few years ago but it’s come in handy more times than I can count. Use it at least three times a week.
Leatherman has the warranty you need. Fantastic products with basically a lifetime warranty on any damage.
I have a tiny, bladeless (so okay with TSA for flying) “pliers”-style multitool that fits on my keychain. I don’t think that the manufacturer makes it any more. Searching for “keychain multitool” will turn up various designs on Amazon.
I also have a separate tiny folding knife — I think a Spyderco Bug, though any tiny knife is gonna be equivalent, and I’m sure that there are more-reasonably-priced tiny knives out there — that fits on my keychain that I take off when I fly.
For infrequently-used tools, those are large enough to be fine for most things, and it’s less of a pain for me to haul around than a full-sized multitool or knife (which I have, in the past, carried).
I don’t know if I’d say that it’s a game-changer for me, but it is convenient to always have said tools at hand.