I use my business card inside the luggage tag holder. I don't care if they have my work email / address / phone. It actually came in handy having my name on the tag at screening 2 days ago in Atlanta - I opt out of the scanner, and had to wait for a female search, and during that time they wanted to check something in my bag that had already gone through. They were able to call out 'hey, do we have an Emma here' and I could identify the bag as mine.