Every time I go away I print my own labels. I have a template set up on my computer and all I have to do is put in the relevant details and print them onto some thin card, then punch a hole and tie on a bit of string - just the job!
It's all well and good being told that the cases get barcoded labels on them. How many times have we stood at the carousel and watched various labels, stickers and even luggage handles going merrily around with all the cases. I'd rather do a "belt and braces" job with my labels just in case their stickers go missing. I don't, of course, ever put my home address on it, just the postcode and number of the house just in case some unscrupulous person is going around the terminal reading luggage labels and ringing their mates back home to tell them that we won't be home for a while - I don't want to get back from holiday and find that my house has been burgled!. I also put a printed label inside the lid, just in case they have to open it because all the labels have come off but, with my recent run of luck, it's more likely to be one of the handles rather than a label.