Norwegian Cruise Line
Each passenger is allowed to carry up to two pieces of personal luggage onboard, with each piece weighing not more than 50 pounds. However, if passengers are traveling by air, they are advised to check with the airline for specific restrictions.
Carnival
Each checked suitcase and carry-on suitcase should not weigh more than 50 pounds, and when lying flat, Bags must not exceed 16 inches high by 24 inches wide (the length of the bag is not a factor). For security screening purposes, all luggage should be unlocked. You are allowed two bags per person.
Royal Caribbean International
Each guest is allowed to carry up to 90kgs of luggage aboard the vessel; however, for your comfort and convenience, it is highly recommended that you limit the number of pieces you take. Bear in mind that airlines may charge for excess or oversized luggage.
MSC
Passengers are encouraged to limit their checked luggage to two suitcases per person (not exceeding 90x75x43 cm in size and 23kg in weight per bag), and one piece of hand luggage per person (not exceeding 56x45x25 cm in size and 23kg in weight per bag).
Costa
No more than two pieces of luggage/suitcases per person in addition to hand luggage. The maximum weight allowed for each piece of luggage is 23 kg. All pieces of luggage will be subject to X-ray safety checks before boarding.