Our friends at iFixIt did a tear down of Apple's new $29 AirTag tracking device. They also identified three safe place to drill a keyring hole if you don't want to buy a bulky and expensive holster.
— Read the restWhile Apple sells an AirTag holder for $13, and cheaper third-party models are already filling up online store listings, a DIY hole gets an AirTag onto a keyring or loop with as little extra space and mass as possible.