I made a hidden compartment to hide an AirTag inside my luggage

If you unzip the fabric lining of your suitcase, there should be some screws that attach the handle to the outside. This will commandeer one of those screws to hide the AirTag beneath the fabric lining (but close to the exterior shell of your luggage). Mine is a Samsonite, but I’m sure it works for others as well!

The holder itself

In situ