https://techcrunch.com/2021/05/06/someone-already-turned-apples-airtag-into-a-slim-wallet-friendly-card/

Apple’s new AirTag item trackers are pretty small, but not quite small enough to slip into most wallets without adding an obvious bit of bulk.

Fortunately, as one talented AirTag owner has found, that’s nothing you can’t fix with a heat gun, a bit of soldering and an understanding that you could totally fry your shiny new AirTag in the blink of an eye. Oh, and a 3D printer.