I haven't used these yet, but Im so excited to ues them next month. Last year I went on my first cruise and was shocked my the baggage process. You staple a folded tag to your luggage and hope it doesnt get ripped off during the journey to your cabin. The tag is the only this attached to your luggage that has your room number on it.  No one in my group lost any of their luggage but I did see several bags sitting near the customer service desk without paper tags. I assumed they were bags that lost the paper tags along the way. On the cruise, only one bag on the entire ship of 4,500 passengers was unaccounted for and I know this because they sent around a missing bag notice. Anyways, Ill feel more comfortable knowing my cabin tags are in this plastic cover.