Apple's AirTags might be the latest thing in personal possession-tracking, although customers might find it hard to actually secure said things with the little monolithic smart pucks out of the box. However, Spigen has stepped up to offer new holders with the keyrings and clips necessary to take such a tag anywhere.
https://www.notebookcheck.net/Spigen-announces-new-AirTag-accessories-in-some-signature-styles-and-designs.537992.0.html