Are they the tags with the elastic band to secure them? Or are they the tags that are paper that you cut out and then "staple" closed around the luggage handle.
If you are talking about the elastic tag ones, then Mike gaveyou the correct answer. If true paper tags, the advice given here a couple of times is to "laminate" them with clear packing tape. (Instead of stapling, apply the tag face down on the sticky side of a long piece of tape than push the tape through your luggage handle and then stick it to itself so it loops around the handle. This will keep the tags on.
Carnival Cruise Lines:
Fantasy 90, Celebration 95, Victory 05, Conquest 05, Spirit 6/06, Freedom 6/08, Holiday 7/08, Victory 6/09, Valor 9/09, Dream 6/10, Splendor 8/10,Conquest 8/11,Magic 11/11,Triumph 4/12,Spirit 7/12,Freedom 11/12, Triumph 2/13 - The fire cruise
NCL Dream October 2006, RCCL Mariner OTS June 2007, Celebrity Silhouette 2013