Carnival no longer mails documents. It must all be done on line including luggage tags.
After you print the tags laminate with clear boxing tape and attach with plastic tie.
If you don't want to do that the porters usually have extra tags at the dock.
7 Norwegian: Sky, Jewel, Dawn, Epic, Pearl, Breakaway, Getaway
9 Windjammer: S/V Legacy X3, S/V Polynesia, S/V Caledonia, S/V Diamant, S/V Sagitta X2 S/V Mandalay