Yes, you must remove liquids from your carry-on at security

The TSA requires you to remove all liquids, gels, and aerosols from your carry-on bag and place them in a separate bin at the security checkpoint. This rule applies to every airport in the United States, regardless of which airline you fly or where you are traveling.

The rule exists because liquids can be harder to screen than solid items. TSA officers need to see each container clearly on the X-ray machine, and some liquids pose safety concerns in pressurized cargo holds. Removing them ahead of time speeds up the screening process for everyone behind you.

You do not need to remove liquids from checked baggage. If you pack liquids in your checked bag, they can stay there throughout security and boarding. However, checked baggage has its own rules about quantity and container size, which differ from carry-on rules.

Key Takeaways

  • All liquids, gels, and aerosols must come out of your carry-on bag and go into a separate bin before you reach the X-ray machine.
  • Each container must be 3.4 ounces (100 milliliters) or smaller, and all containers must fit inside a single quart-sized clear plastic bag.
  • Liquids in checked baggage do not need to follow the 3.4-ounce limit, but there are still restrictions on what you can pack.
  • Common items that count as liquids include shampoo, toothpaste, peanut butter, yogurt, jam, and sunscreen — not just water and juice.
  • You can bring an empty water bottle through security and fill it at a fountain after you pass the checkpoint.

What counts as a liquid under TSA rules

The TSA defines liquids broadly. They include not just water and beverages, but also gels, creams, pastes, and aerosols. Toothpaste, shampoo, conditioner, lotion, sunscreen, deodorant, and hairspray all count. So do peanut butter, jam, honey, yogurt, and other spreadable foods.

The rule of thumb: if it would spill or spread if you turned the container upside down, it is a liquid. Solid foods like granola bars, cheese, and sandwiches are fine. Powders like talc, baby powder, and protein powder are also allowed in carry-on bags, though they may be subject to additional screening.

Medications in liquid or gel form follow the same 3.4-ounce rule as other liquids, but you do not need to pack them in the quart-sized bag. You can keep them in your personal bag or carry-on. Bring a copy of the prescription or a label showing your name if you are concerned about questions at security.

The 3-1-1 rule for carry-on liquids

TSA uses a straightforward system called 3-1-1. The numbers mean: containers of 3.4 ounces (100 milliliters) or smaller, all fitting in 1 quart-sized clear plastic bag, and 1 bag per passenger.

You can buy a quart-sized bag at any drugstore, or TSA will provide one at the checkpoint if you do not have one. The bag must be clear so officers can see inside without opening it. Gallon-sized bags and opaque bags do not meet the rule.

If a container is larger than 3.4 ounces, you cannot bring it in your carry-on, even if it is only half full. You must either check it, leave it at home, or buy a travel-sized version. Many brands sell small bottles of shampoo, lotion, and other toiletries specifically for travel.

Liquids in checked baggage

Checked bags have different rules. You can pack containers larger than 3.4 ounces, and you do not need to use a quart-sized bag. However, there are still limits. Most airlines allow up to 5 liters (1.3 gallons) of alcohol per passenger in checked baggage, and some liquids are banned from checked bags entirely.

Flammable liquids like paint thinner, gasoline, and lighter fluid cannot go in checked baggage. Neither can certain aerosols, some cleaning products, and some pesticides. If you are unsure whether a specific product is allowed, check your airline's website or call them before you pack.

Pack liquids in checked baggage in the center of your bag, surrounded by clothing or other soft items that can absorb leaks. Use plastic bags as an extra layer of protection. Even though liquids are allowed, a leak can damage your clothes and other items, and it can create a mess for baggage handlers.

What happens at security if you forget

If you reach the X-ray machine with a liquid container larger than 3.4 ounces, or with liquids not in a quart-sized bag, TSA officers will stop you. They will ask you to remove the item. You then have a choice: throw it away, go back to check it, or leave the security line to find a friend or family member outside security to take it.

If you go back to check a liquid, you will need to repack your bag, go back through the security line, and start the screening process over. This takes time, especially during busy travel periods. Arriving early and packing liquids correctly the first time avoids this delay.

TSA does not charge you for throwing away a liquid. Officers dispose of it in a designated container. You do not get a refund for the product.

Tips for traveling with liquids

Pack all your liquids in the quart-sized bag before you leave home. Put the bag on top of your carry-on so it is straightforward to grab when you reach the checkpoint. This saves time and keeps the line moving.

If you need more than 3.4 ounces of a liquid, buy travel-sized bottles and refill them during your trip, or check the item. Many hotels provide shampoo and lotion, so you may not need to bring your own toiletries at all.

Empty water bottles are allowed through security. Bring an empty bottle and fill it at a water fountain or refill station after you pass the checkpoint. This saves money and avoids the need to buy bottled water at airport prices.

If you are traveling with medications in liquid form, keep them in their original labeled containers. You can keep them in your personal bag instead of the quart-sized bag, and you do not need to remove them at security unless an officer asks.

International travel and liquids

The 3-1-1 rule applies to flights departing from U.S. airports. If you are flying internationally from the United States, you still follow this rule at your departure airport.

When you arrive at your destination country, that country's rules explore. Many countries follow the same 3-1-1 rule, but some have different limits. Check the rules for your destination before you pack. If you are connecting through another country, you may need to repack your liquids at the connection point.

Liquids you buy after passing through security at a U.S. airport can be carried onto your next flight if that flight is also departing from the United States. However, if you are connecting internationally, you will need to check those items or leave them behind, depending on the rules of your destination country.

Frequently Asked Questions

Can I bring a full water bottle through security?

No. Any liquid-filled container, including water bottles, must be 3.4 ounces or smaller. Bring an empty bottle and fill it at a water fountain after you pass security. Most airports have refill stations near gates.

Do I have to remove liquids if I have TSA PreCheck?

No. TSA PreCheck members do not need to remove liquids, shoes, belts, or light jackets at security. You still need to follow the 3-1-1 rule for what you pack, but you can leave the quart-sized bag in your carry-on.

What if my liquid container says 3.4 ounces but looks full?

The limit is 3.4 ounces by volume, not by weight. If the label says 3.4 ounces or 100 milliliters, it meets the rule, even if it appears full. TSA officers check the label, not the fill level.

Can I bring baby formula or breast milk through security?

Yes. Baby formula, breast milk, and baby food are exempt from the 3-1-1 rule. You do not need to pack them in a quart-sized bag, and containers can be larger than 3.4 ounces. Inform an officer that you are carrying these items when you reach security.

Do I need to remove my deodorant at security?

Yes, if it is a gel, cream, or aerosol. Solid stick deodorant does not count as a liquid and does not need to be removed. Spray and gel deodorants must go in your quart-sized bag and follow the 3.4-ounce limit.