How Much Liquid You Can Bring Through TSA Security

The 3.4-ounce rule for carry-on bags

You can bring liquids, gels, and aerosols through TSA security in your carry-on bag only if each container holds 3.4 ounces (100 milliliters) or less. This is the 3-1-1 rule: 3.4 ounces per container, 1 quart-sized clear bag, 1 bag per passenger. Anything larger than 3.4 ounces must go in your checked baggage instead.

The limit applies to the container size, not how full it is. A 4-ounce bottle that is half-empty still violates the rule and will be confiscated. TSA officers measure by the container's labeled capacity, not its contents.

This rule exists because the TSA classifies liquids as a potential security risk in the pressurized cabin of an aircraft. The restriction has been in place since 2006 and applies to all U.S. airports and most international airports where U.S. carriers operate.

Key Takeaways

• Each liquid container in your carry-on must be 3.4 ounces or smaller, and all containers must fit inside one clear quart-sized bag.
• Checked baggage has no size limit for liquids, so full-sized bottles of shampoo, lotion, and other products can go in your suitcase.
• Common liquids include shampoo, conditioner, lotion, toothpaste, peanut butter, yogurt, jam, and any product that flows or spreads.
• Frozen liquids are treated as solids if completely solid when you reach security, but partially frozen items count as liquids.
• Medications and baby formula have different rules and may be brought in quantities larger than 3.4 ounces if you declare them.

What counts as a liquid under TSA rules

TSA defines liquids broadly to include anything that flows, spreads, or is pourable. This covers obvious items like water, juice, and shampoo, but also includes products you might not think of as liquids. Peanut butter, yogurt, jam, honey, and hummus all count as liquids because they spread or flow.

Gels and aerosols follow the same 3.4-ounce limit. Gel deodorant, hair gel, sunscreen, and spray deodorant all fall under this rule. Solid deodorant does not. Toothpaste is a gel and must follow the 3.4-ounce limit, even though many people carry it in their carry-on without thinking about it.

Creams and lotions are liquids. This includes face cream, body lotion, lip balm in a tube or jar, and moisturizer. If you are unsure whether a product counts, the safest approach is to assume it does and pack it in your checked bag or buy a travel-sized version under 3.4 ounces.

Checked baggage has no liquid restrictions

You can pack full-sized bottles and containers of any liquid in your checked suitcase with no size limit. This is where your regular shampoo bottle, full jar of lotion, and large bottle of cologne belong if you want to bring them. Checked bags are screened differently than carry-on bags, and the TSA does not explore the 3.4-ounce rule to them.

Pack liquids in the center of your suitcase, surrounded by clothing or other soft items, to reduce the risk of breakage during handling. If a bottle leaks, it will damage your other belongings. Many travelers wrap bottles in plastic bags or use leak-proof travel containers even for checked baggage.

Remember that airlines also have weight limits for checked bags, typically 50 pounds. A suitcase full of heavy liquids can approach or exceed this limit, so check your airline's baggage policy before packing.

The clear quart-sized bag requirement

All your 3.4-ounce containers must fit inside a single clear, quart-sized plastic bag. A quart is 32 ounces by volume, which is roughly the size of a gallon-sized freezer bag cut in half. You can buy TSA-compliant bags at most drugstores, or use any clear plastic bag that is roughly that size — TSA officers have some flexibility on the exact dimensions as long as the bag is clearly quart-sized.

The bag must be clear so officers can see what is inside without opening it. This speeds up security screening. You remove the bag from your carry-on at the security checkpoint and place it in a bin for X-ray screening, then put it back in your bag once cleared.

You are allowed only one bag per person. If you have more than one quart-sized bag of liquids, you will need to repack or check the excess items. Some travelers keep a dedicated quart bag packed year-round so they do not have to assemble it at the airport.

Medications and baby formula exceptions

Medications in liquid form do not have to follow the 3.4-ounce limit if you declare them to TSA officers. Bring them in their original labeled containers with your name on the label. Place them in a separate bag from your other liquids — do not mix them in your quart-sized bag. Tell the officer at security that you have medications before your bag goes through screening.

Infant formula, breast milk, and juice for a baby or toddler also do not count toward the 3.4-ounce limit. You can bring reasonable quantities in any size container. You do not need to open these containers for inspection, though officers may ask to test them. If you are traveling with a child, keep these items easily accessible in your carry-on.

Prescription medications should be in their original pharmacy bottle with your name and the medication name printed on the label. Over-the-counter medications in liquid form, such as children's pain reliever or cough syrup, should also be in their original containers. Homemade or unlabeled liquid medications may be confiscated.

Frozen and partially frozen liquids

A liquid that is completely frozen solid is treated as a solid and does not count toward the 3.4-ounce limit. Ice, a frozen water bottle, or a completely solid block of frozen juice can go through security without restriction. However, if any part of the item is liquid or slushy when you reach the checkpoint, it counts as a liquid.

Partially frozen items — such as a bottle of juice that is partially slushy or a gel pack that is thawing — are treated as liquids and must follow the 3.4-ounce rule. TSA officers make the information at the checkpoint based on the item's state when screened. If you freeze a liquid intentionally to bypass the rule and it thaws during screening, it will be confiscated.

Dry ice is not considered a liquid and has its own rules. You can bring dry ice in checked baggage only, in quantities up to 5.5 pounds, and it must be properly packaged. Dry ice is not allowed in carry-on bags.

What happens if you exceed the limit

If a container larger than 3.4 ounces is found in your carry-on bag, TSA officers will confiscate it. You do not get it back, and there is no refund or exception. The item is thrown away. This happens frequently with travelers who forget about a full-sized shampoo bottle or bring a large jar of face cream.

Being honest with the officer about what you are carrying does not change the outcome — the item will still be confiscated if it exceeds the limit. However, declaring items upfront allows you to remove them before screening and repack them in your checked bag if you have time, rather than discovering the problem at the X-ray machine.

Confiscation is not a fine or penalty; it is straightforward the enforcement of the rule. You will not be cited or delayed beyond the normal screening process. If you are traveling frequently, it is worth buying travel-sized versions of your regular products to keep in a dedicated quart bag.

International travel and TSA PreCheck

The 3.4-ounce rule applies to flights departing from U.S. airports, regardless of your destination. It also applies to connecting flights through U.S. airports. If you are flying from a foreign airport to the United States, that country's security rules explore at departure, and the TSA rule applies when you land in the U.S. or connect through a U.S. airport.

TSA PreCheck members still follow the 3.4-ounce rule. PreCheck speeds up security screening and allows you to keep shoes, belts, and light jackets on, but it does not exempt you from liquid restrictions. You still need your quart-sized bag of liquids, though you may not need to remove it from your carry-on at some PreCheck lanes.

Some international airports have different liquid rules for flights to the United States. Always check the security requirements of your departure airport before packing. If you are unsure, pack all liquids larger than 3.4 ounces in your checked bag.

Frequently Asked Questions

Can I bring a full water bottle through security?

No. An empty water bottle can go through security, and you can fill it at a water fountain or refill station after you clear the checkpoint. A full water bottle will be confiscated. Many airports have water refill stations near gates, so you can fill your bottle once you are past security.

Does toothpaste count as a liquid?

Yes. Toothpaste is classified as a gel and must be 3.4 ounces or smaller. A standard tube of toothpaste is usually around 5.1 ounces, so you will need a travel-sized tube for your carry-on. Solid toothpaste tablets do not count as liquids.

Can I bring multiple quart bags if I have a lot of liquids?

No. TSA allows one quart-sized bag per passenger. If you have more liquids than fit in one bag, the excess must go in your checked baggage. Repack before you arrive at security to avoid delays.

What if my medication is in a container larger than 3.4 ounces?

Medications in their original labeled containers do not have to follow the 3.4-ounce limit. Declare them to the officer before screening and keep them in a separate bag from your other liquids. The officer may ask to test the medication.

Are there any liquids that are completely banned?

No liquids are completely banned from checked baggage. Some hazardous materials like certain cleaning products or flammable liquids are restricted in both carry-on and checked bags under Department of Transportation rules, but these are rare for typical travelers. Check your airline's hazardous materials policy if you are unsure about a specific product.