A Victorinox Manager. It contains a small blade, a bottle opener with a magnetic Phillips screwdriver, a pen, a nail file, scissors and tweezers, all in a very compact form factor.

Is there a reason to carry both some kind of lighter and a bottle opener? A bic does both…

A hardware authenticator

I was gifted a tiny refillable keychain lighter. I didn’t think I needed it at first but it’s turned out invaluable to always have some fire handy. I don’t smoke so I don’t normally have a lighter with me otherwise.

Like this: https://sdjsports.com/products/true-utility-firestash-mini-tool

• They make belt buckles that double as bottle openers for roadside Topo Chico and tacos, or beer (not roadside, don’t drink and drive).
• I have a tough little metal USB drive with a size A jack on one side, whatever fits my phone on the other, and firmware to be able to plug into said phone.
• Musicians ear plugs in a tough metal keyring pill case.