Don’t rock the boat — you should avoid bringing these items on your next cruise, an expert warns. Gary Bembridge, an avid travel and cruise extraordinaire, revealed the common items that are barred from popular liners. The first, he explained, are surge protectors, extension cords or “anything allowing multiple plugs.” “All cruise lines ban any extension cord with a surge protector feature,” he said, per The Mirror, adding that the cables are a fire hazard.