To tag your luggage for a cruise, you typically use the printable paper tags provided in your digital cruise documents (edocs). Once you check in online, you can print these tags, which contain your name, ship, and stateroom number. Most cruisers recommend folding the paper tag as instructed and then reinforcing it with clear packing tape to prevent it from ripping off during the heavy-handed loading process. A more modern and professional method is to purchase clear plastic luggage tag holders (available on sites like Amazon) designed specifically for cruise lines; you simply slide your folded paper into the plastic sleeve and attach it to your bag's handle with a reinforced metal ring. You should attach these tags after your flight but before you arrive at the cruise terminal. This ensures that the cruise porters can easily identify your bag and deliver it directly to your cabin door, usually by the late afternoon of your embarkation day.