The “3-1-1 rule” on United Airlines, and in fact, for all airlines flying within the United States, is a guideline for carrying liquids, aerosols, and gels in your carry-on luggage. It refers to: 3 – each container must be 3.4 ounces (100 milliliters) or less; 1 – all containers must fit into a single, quart-sized, clear, resealable plastic bag; 1 – only one such bag is allowed per passenger.
Essentially, this rule ensures that any potentially hazardous liquids are easily identifiable and limited in quantity when going through airport security.
Here’s a more detailed breakdown:
3.4 ounces (100 milliliters) or less: Each liquid, aerosol, gel, cream, or paste container must be 3.4 ounces (100 milliliters) or less.
One quart-sized bag: All these containers must fit into a single, clear, resealable plastic bag that is no larger than one quart (approximately 0.95 liters) in size.
One bag per passenger: Each passenger is allowed to bring one such bag through security.
Medically necessary liquids: Items like baby formula, breast milk, and medications (even if larger than 3.4 ounces) may be allowed in larger quantities, but they need to be screened separately by TSA.
Exceptions: The 3-1-1 rule does not apply to items in checked baggage.
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