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The 3-1-1 rule is not specific to Royal Caribbean but comes from the TSA (Transportation Security Administration) rules for carrying liquids on flights. It means:
How can I book a Royal Caribbean cruise?

3: Liquids, gels, and aerosols must be in containers of 3.4 ounces (100 ml) or less.

1: All containers must fit inside 1 quart-sized, clear, resealable plastic bag.

1: Each passenger is allowed 1 bag.
What is the 3 1 1 rule on Royal Caribbean cruises?
How can I book a Royal Caribbean cruise?
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This applies only to air travel before your cruise (when flying to the port).

Once you’re onboard Royal Caribbean, the cruise line has its own rules:

You can bring non-alcoholic beverages (up to 12 cans or bottles, 17 oz each) or one bottle of wine/champagne per adult on embarkation day.

Full-sized toiletries (like shampoo, sunscreen) are allowed in your checked or carry-on luggage for the cruise—no TSA 3-1-1 restriction onboard.

So, remember: The 3-1-1 rule matters for your flight, not the cruise itself.

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