Having done my first cruise last month I'm thinking about my next one, and having a carry on case (instead of a bag) in addition to my main case.
Reason being that your case has to be outside your cabin by midnight the night before you depart. Depending on your onward travel you could be waiting around most of the day for your flight, and I found it would have been handy to have a structured carry on case in which to pack some travel toiletries and a change of clothes along with all the travel gubbins like iPad, book, documents etc.
Anyone got any recommendations? I'm thinking it should be wheeled, and have a big front pocket for documents.