Carnival Cruise Line is changing the rules for passengers to make it harder for them to travel with their own alcohol. (Source: USAToday.com)

In particular, the company wants to stop passengers from smuggling their own booze, disguised as bottled water.

Starting July 9, drinks must be packaged in unopened cans or cartons, with no more than 12 cans or cartons in carry-on luggage.

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There are some exceptions to the new rule, according to NOLA.com:

  • At the beginning of the cruise during embarkation day only, guests (21 years of age and older) may bring one 750 milliliter bottle of sealed/unopened wine or champagne per person in their carry-on luggage.
  • A $15 corkage fee (a charge exacted at a restaurant for every bottle of wine served that was not bought on the premises) per bottle will be charged should guests wish to consume their wine or champagne in the main dining room, steakhouse or bar.
  • All alcohol purchased in ports of call or on board will be returned on the morning of debarkation.
  • Guests are prohibited from bringing large coolers on board because they are an impediment to the boarding and security process. Small personal-sized coolers, no larger than 7.5 gallons in volume, for carrying small quantities of non-alcoholic beverages or medications are permitted as carry-on luggage.