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3-1-1 Rule for Liquids in Carry-On Bags

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Definition:

The 3-1-1 Rule refers to the Transportation Security Administration's rule for how much liquid travelers can take on an airplane in their carry-on bags. It does not prohibit you from putting larger sizes of liquids in your checked baggage.

3-1-1 refers to:

- Each liquid you want to carry on must be in 3.4 ounce (or less) container. That's the "3"

- The containers must be in 1 clear quart-sized plastic bag. That's a "1"

- Each passenger is allowed only 1 bag. That's the second "1"

The clear plastic bag limits the total amount of liquid you can take to what fits in the bag.
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