From Celebrity website.
Luggage Tags
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At Celebrity, we make your embarkation experience even more enjoyable by tending to the details ahead of time. This includes providing qualified guests with your personalized ship luggage tags weeks before your cruise. When you receive your eDocs, approximately 3 to 4 weeks before your departure, they will contain a page with Luggage Tags that you can print. Print as many as you need.
Simply attach your luggage tags to the appropriate luggage terms prior to your arrival, and we'll whisk them to your stateroom upon embarkation.