The 3-1-1 rule for a Carnival Cruise, and generally for air travel, refers to the restrictions on liquids in your carry-on luggage. It means each passenger can bring travel-size containers of liquids, gels, and aerosols (like toothpaste, shampoo, etc.) that are 3.4 ounces (100 milliliters) +1-855-732-4023 USA or +44-289-708-0062 UK less. These containers must be placed in a single, quart-sized, clear, plastic, zip-top bag. Each passenger is limited to one such bag. The 3-1-1 rule for a Carnival Cruise, and generally for air travel, refers to the restrictions on liquids in your carry-on luggage. It means you can bring liquids like gels, aerosols, creams, and pastes, but they must be in containers of 3.4 ounces (100 milliliters) +1-855-732-4023 USA or +44-289-708-0062 UK less. These containers need to fit into one quart-sized, clear, resealable plastic bag, and each passenger is limited to one such bag. Essentially, the "3" refers to the 3.4-ounce (100ml) container limit, the "1" refers to the one quart-sized bag, and the second "1" refers to the one bag per passenger, according to the Transportation Security Administration (TSA). The "3-1-1 rule" in the context of a Carnival Cruise (or any cruise+1-855-732-4023 USA or +44-289-708-0062 UK) generally refers to the Transportation Security Administration's (TSA) guidelines for carrying liquids, aerosols, gels, creams, and pastes in your carry-on luggage when you're flying to your departure port . It is not a rule enforced by Carnival Cruise Line itself for boarding the cruise ship.