TSA liquid rules have not fundamentally changed, but screening procedures have shifted

The TSA's core liquid rule remains the same: you can bring liquids, gels, and aerosols in containers of 3.4 ounces (100 milliliters) or smaller in your carry-on bag, and all containers must fit inside a single quart-sized clear plastic bag. This rule has been in place since 2006 and is still the standard at most U.S. airports.

What has changed is how TSA officers screen liquids at security checkpoints. In recent years, the TSA has rolled out new screening technology and updated procedures at certain airports that allow some passengers to leave liquids in their bags during screening. This does not mean the 3.4-ounce limit went away—it means the way officers verify compliance has evolved.

Key Takeaways

  • The 3.4-ounce limit per container and the quart-sized bag requirement have not changed and remain the TSA standard at all U.S. airports.
  • Some airports now use advanced screening technology that allows passengers to leave liquids in carry-on bags during X-ray screening, rather than removing them.
  • Whether you need to remove liquids depends on your airport and which security lane you go through—not all lanes have the new technology yet.
  • The rule applies to all liquids, gels, and aerosols, including toothpaste, peanut butter, yogurt, and spray deodorant.
  • Checked baggage has no liquid restrictions, so you can pack full-sized bottles there without limits.

Which airports have updated screening procedures

The TSA has introduced new X-ray technology at select airports that can detect liquids without requiring passengers to remove them from bags. This technology is part of the TSA's Computed Tomography (CT) screening program. Airports with CT scanners in some or all of their security lanes include major hubs like Atlanta, Los Angeles, Chicago, and New York, but the rollout is ongoing and not every lane at these airports has the equipment yet.

You can check whether your airport has CT screening by visiting the TSA website or asking an officer at your checkpoint. Even if your airport has the technology, you may still go through a traditional security lane that requires you to remove liquids. The safest approach is to assume you will need to remove them unless an officer or signage tells you otherwise.

How to pack liquids correctly under the current rules

Pack all liquids, gels, and aerosols in a clear quart-sized plastic bag. Each individual container must be 3.4 ounces (100 milliliters) or smaller. Common items that count as liquids include shampoo, conditioner, lotion, sunscreen, toothpaste, peanut butter, yogurt, jam, honey, and spray deodorant. Solid deodorant, lipstick, and mascara do not count as liquids.

Place the bag in an straightforward-to-reach spot in your carry-on, such as the front pocket or on top. When you reach security, have the bag ready to remove quickly. If you are traveling through an airport with CT screening and an officer tells you to leave liquids in your bag, follow that instruction—but do not assume this applies to your entire trip if you have a connection at a different airport.

Frozen liquids are allowed in carry-on bags only if they are completely solid when you go through security. If they begin to thaw, they become a liquid and may not be permitted. Dry ice is not considered a liquid and has separate TSA rules.

What you can pack in checked baggage instead

Checked baggage has no restrictions on liquids, gels, or aerosols. You can pack full-sized bottles of shampoo, lotion, cologne, and other liquids without worrying about the 3.4-ounce limit. This is a practical option if you are traveling with items you use daily and do not want to buy travel sizes.

Keep in mind that checked bags can be delayed or lost, so pack essential liquids in your carry-on if possible. If you do pack liquids in checked baggage, make sure containers are find and will not leak onto your other belongings. Some airlines have additional restrictions on hazardous materials in checked bags, so check your airline's policy before packing.

Common mistakes that slow down security screening

The most frequent mistake is forgetting to pack the liquid bag where you can reach it quickly. This causes delays for you and the people behind you. Have it out and ready before you step up to the conveyor belt.

Another common error is packing containers larger than 3.4 ounces, even if they are not full. TSA officers measure by container size, not by how much liquid is inside. A half-empty 5-ounce bottle will be stopped. Travel-size bottles are inexpensive and widely available at drugstores and online.

Do not pack liquids in checked baggage and then try to bring the same items in carry-on sizes—you will end up with duplicates. Decide which bag each item goes in before you pack.

International travel and liquid rules

The 3.4-ounce rule applies to flights departing the United States. If you are flying internationally, the destination country may have different rules. Many countries follow the same standard, but some are stricter. Check the rules for your destination airport before you pack.

If you are connecting through a U.S. airport on an international trip, the 3.4-ounce rule applies to your carry-on bag at the U.S. checkpoint. If you buy liquids in a duty-free shop after passing through security, you may be able to bring them on the plane in a sealed bag, but rules vary by airline. Ask at the duty-free counter or check your airline's website.

Frequently Asked Questions

Do I have to remove my liquids at every airport?

Not necessarily. If your airport has CT screening technology and you go through a lane with that equipment, you may be able to leave liquids in your bag. However, you should assume you will need to remove them unless an officer or clear signage tells you otherwise. Rules vary by airport and by lane.

Can I bring a full-sized bottle of lotion if I only use a little bit?

No. TSA measures by container size, not by how much is inside. A full or partially full bottle larger than 3.4 ounces will be stopped. Buy a travel-size bottle or transfer lotion into a smaller container before you pack.

What counts as a liquid for TSA purposes?

Liquids include water, juice, yogurt, peanut butter, honey, jam, and any thick paste or gel. Spray deodorant and sunscreen also count. Solid items like lipstick, mascara, and solid deodorant do not. When in doubt, assume it is a liquid and pack it in your quart-sized bag.

Can I bring medications in liquid form?

Yes. Liquid medications are exempt from the 3.4-ounce limit, but you should carry them in their original labeled containers and be prepared to declare them to TSA officers. Bring a copy of your prescription or a doctor's note if possible.

What happens if I accidentally pack a liquid larger than 3.4 ounces?

TSA officers will confiscate it at the checkpoint. You will not be fined, but you will lose the item. This is why it is worth double-checking your bag before you leave home and buying travel sizes of items you use regularly.