Keeping track of bags you check at the airport can be easy. Using a stencil kit and a metallic Sharpie you can code your bags as required. Stencil on your cell phone number or your name and address. This makes for a “permanent” marking on each of your cases. This works just as well on fabric as it does the hard size cases. My system is simple. I abbreviate everything so my assistant and I know exactly what each case contains. Example, “N” for Nikon or “C” for Canon. I also give each case a number. For example case “17” has a complete Lumedyne set up. By keeping a cheat sheet book on all your gear, you know what case “17” holds along with all the contents and any serial numbers. This makes traveling easier as you have a record of all the gear, serial numbers and contents for each of your numbered cases.
Another tip I like with stenciling is actually from a friend of mine. He takes Rosco scene paint, black, and on the bottom of all his cases he paints out an area sealing up the fabric. Next he uses a stencil he had made at his local sign shop and paints in with the color of choice using spray paint.