We just came back form a cruise in which we were given e docs. Our travel agent also gave us blank luggage tags that looked like the old ones issued by RCCL. We just wrote in info (ship name, cabin etc.
If you can't get those I was going to try clear packing tape. I was going to wrap it around the handle with the paper stuck in the middle. It is very strong and I figured it was a cheaper way to go.