AirTag Bookmark
thingiverse
I couldn't find anything like it so i created one, it works great, i dipped the airtag portion in some hot water to soften it for the airtag to slip in easier, which worked great and it doesn't spin or jiggle.
Download Model from thingiverse
With this file you will be able to print AirTag Bookmark with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on AirTag Bookmark.