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What is the 3-1-1 flight rule?

You are allowed to bring a quart-sized bag of liquids, aerosols, gels, creams and pastes through the checkpoint. These are limited to 3.4 ounces (100 milliliters) or less per item. This is also known as the 3-1-1 liquids rule.



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Back here in the U.S., though, 3-1-1 remains the prevailing order, for the foreseeable future, when it comes to liquids, gels, aerosols, creams, and pastes. And those rules remain: No single bottles of more than 3.4 ounces, all bottles in one clear plastic bag, with no more than one such bag per passenger.

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The TSA's liquid limit for carry-ons—known as the 3-1-1 rule—allows travelers to pack liquids, aerosols, gels, creams, and pastes under 3.4 ounces (100 milliliters) in their carry-on bags. Passengers are allowed up to one quart-sized bag per person, or roughly nine 3.4-ounce containers in a single quart-sized bag.

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Liquids, gels and aerosols packed in carry-on must follow the 3-1-1 liquids rule:
  • 3.4 ounces or less per container.
  • 1 quart size, clear, plastic, zip top bag (all liquids must fit in bag)
  • 1 bag per passenger.


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The TSA prohibits containers with more than 3.4 ounces of liquid in carry-on luggage, so if you have a liquid or semi-liquid antiperspirant, be sure to check the quantity on the container. For example, many stick deodorants and antiperspirants come in sizes under 3.4 ounces, so it's fine to bring in your carry-on bag.

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Safety Razors: Because the razor blades are so easy to remove, safety razors are not permitted in your carry-on luggage with the blade. They're fine to pack in your carry-on without the blade. The blades must be stored in your checked luggage. The same applies for straight razors.

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But what are they, and is deodorant considered a liquid when flying? Deodorant can be considered a liquid when flying if it is in a gel or aerosol form. If your deodorant is solid, though, the TSA will let you bring a standard stick of solid deodorant with you in your carry-on luggage.

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Firearms, ammunition, and fireworks are prohibited, as are all knives and safety razors (including pocket knives and Swiss Army knives). Straight razors and replacement blades for straight razors are also not allowed. Most tools also cannot be packed in carry-on luggage, as they have the potential to cause harm.

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Each passenger is limited to one quart-size bag of liquids, gels and aerosols. Common travel items that must comply with the 3-1-1 liquids rule include toothpaste, shampoo, conditioner, mouthwash and lotion.

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There are no TSA restrictions on Chapstick. Even though it smears and spreads onto the lips, Chapstick is not considered a liquid by the TSA. You can just toss your chapstick in your carryon bag or checked luggage.

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Toothpaste is considered a liquid by the TSA (Transport Security Agency), even though it's technically a paste. In fact, all pastes, gels, waxes, and lotions are also classified as liquids. And even today, these substances are still restricted by the 3-1-1 rule in hand luggage due to safety threats.

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Yes, you can take tweezers on a plane and pack them in your carry-on and/or checked bag. It's beneficial to pack them properly to avoid any inconvenience.

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Stick deodorant is fine in any size. Well, almost any size… Powders and crystals are good to go as well. Spray, Gel, Liquid, Cream, Pastes, and Roll-On deodorants need to be in containers no larger than 3.4 ounces and placed in a clear quart-sized baggie.

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Nail clippers are also allowed on planes, according to the Transportation Security Administration (TSA). You can pack them in both your carry-on and checked luggage. Similar to tweezers, it's a good idea to wrap your nail clippers or place them securely in a bag to avoid injury to others handling your luggage.

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But if you're new to electric toothbrushes, you may wonder, “Can I pack an electric toothbrush in a carry-on?” The Transportation Security Administration (TSA) says yes. Electric toothbrushes can be packed in carry-on or checked luggage.

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Any hairspray you bring on a plane in carry on baggage must be in 3.4 ounce containers or smaller, and it must fit in your liquids bag. If you're traveling with a larger bottle of hairspray, pack it in checked luggage, and make sure the container is 18 ounces (16 fluid ounces) or smaller.

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Solid food items (not liquids or gels) can be transported in either your carry-on or checked baggage. TSA officers may instruct travelers to separate items from carry-on bags such as foods, powders, and any materials that can clutter bags and obstruct clear images on the X-ray machine.

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Do Toiletry Bags Need to Be Clear? TSA does not specify that toiletry bags need to be clear. However, when traveling with liquids, using a TSA approved clear liquid bag will help expedite the TSA process so agents can see everything easily without further inspection.

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You should check with your airline first, but most domestic airlines permit a carry-on piece of luggage that is 45 linear (total) inches. A common sized bag for carry-on luggage is 22x 14x 9. Most airlines have a carry-on weight limit of 40 pounds.

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