The Allegiant 311 rule is a security measure that limits the amount of liquids, gels, and aerosols you can carry in your hand luggage. Each container should be no larger than 3.4 ounces, and all must fit in a single, clear, quart-sized bag. Following this rule is crucial for passing through security smoothly. Want to ensure you’re ready for your Allegiant flight? Learn how to pack according to the 311 rule.