We are going to listen to Rick Steves this cruise and try carry on bags only. I don't think it will be an issue since I'm traveling with my 2 sons 14 and 26. But I am wondering about a razor for me and older DS. Can we have one in our ziplock of liquids? or just buy one onboard? We are going to forgo the formal night dining room so we don't have to pack dress clothes. Anyone else just using carry ons?