I do the "packing tape lamination" method. I then take a hole punch and punch a hole at the top of the tag. I then put them with my other travel documents.
Before I get on the ship, either at the hotel or the airport, I will take out the luggage tags and attach the tags to my bags with a cable tie. Just throw a few ties in your travel wallet or carry-on.
Ahh: I remember the days when you received your tags and documents in a fine document wallet. Those days are long gone. Unless you sail on the lux lines.