PRODUCT RATING: 4.5 Out of 5 Stars, (Blank: Not Rated). Click on link to see more information, images, reviews by verified users and any alternatives:

A must have when you are packing your cruise luggage.
Package include:

2 Cruise Lanyards
2 Waterproof PVC ID holders
2 Crew Thank You Cards

Material: Water-proof card holder, the sealable zipper will keep your cabin card from water. Lanyards are Made from  Super Soft nylon, very comfortable to the neck. Can be reused for your future cruises. Avoid the pricy lanyards onboard.
Quantity – 2 packs/set. Two extra CREW THANK YOU CARDS are included in the package.
Crew Thank You Cards- Each package includes two pcs of thank you cards. Crew members are part of your cruise. Their service deserves more appreciation. These cards are much better for tipping the cruise crew than just handing them cash. As a retired crew member, I knew it.
Cruise Lines Coverage-Fits All cruise lines, Carnival, Royal Caribbean, Celebrity, NCL, Celebrity etc. Cruise lanyards are made to fit cruise itineraries worldwide, whether you are in Caribbean, Mediterranean or Alaska, your card will be protected.
List Price: $9.99