Definition: Refers to the TSA policy regarding the amount and size of liquid items permitted in carry-on bags. Breakdown of the 3-1-1 rule:
- 3 - only 3-ounce or smaller containers of liquids or gels (by volume) permitted
- 1 - 1 quart-sized, clear, plastic, zip-top bag to hold liquid containers
- 1 - 1 bag per passenger