Yes, you must remove liquids from your carry-on bag at TSA checkpoints

The TSA's 3-1-1 rule requires you to remove all liquids, gels, and aerosols from your carry-on bag and place them in a single quart-sized clear plastic bag before you reach the security scanner. This rule applies at every TSA checkpoint in the United States. The officer will ask you to take out the bag, and you'll place it in a bin on the conveyor belt to be X-rayed separately.

The reason for this rule is that the TSA cannot clearly see liquids on standard X-ray machines, so they need to inspect them separately. Removing them before you reach the scanner speeds up the process for everyone behind you and reduces the chance that an officer will need to open your entire bag to find them.

Liquids you pack in checked baggage do not need to follow the 3-1-1 rule—you can pack full-sized bottles there. The restriction applies only to what you carry onto the plane.

Key Takeaways

  • All liquids, gels, and aerosols in carry-on bags must be 3.4 ounces (100 milliliters) or smaller and placed in a single quart-sized clear plastic bag.
  • You must remove the bag from your carry-on and place it in a bin before the security scanner, not after you've already gone through.
  • Common items that count as liquids include toothpaste, shampoo, conditioner, lotion, sunscreen, peanut butter, yogurt, and jam.
  • Checked baggage has no liquid restrictions, so you can pack full-sized bottles there if you need them for your trip.
  • If you forget to remove liquids, the TSA officer will catch them during screening and may confiscate the items or require you to step aside while they inspect your bag.

What counts as a liquid under the 3-1-1 rule

The TSA defines liquids broadly to include anything that flows, spreads, or sprays. This covers obvious items like water, juice, and shampoo, but also includes things many travelers don't expect: peanut butter, yogurt, jam, honey, hummus, and cream cheese all count as liquids because of their consistency.

Gels and aerosols fall under the same rule. Deodorant, hairspray, shaving cream, and sunscreen are all restricted. Even solid items like lip balm or solid perfume are treated as liquids if they can liquefy or spread at room temperature or during flight.

A few items are exempt: medications in liquid form (like insulin or liquid antibiotics) are allowed in reasonable quantities beyond the 3.4-ounce limit, though you should declare them to the officer. Baby formula and breast milk are also exempt if you're traveling with an infant or young child.

How to pack liquids correctly for TSA screening

Buy a quart-sized clear plastic bag—these are inexpensive and sold at most drugstores, or the TSA provides them free at checkpoints if you don't have one. Place all containers of 3.4 ounces or smaller inside this single bag. You cannot use multiple bags or a larger bag; it must be one quart-sized bag.

Each individual container must be 3.4 ounces (100 milliliters) or smaller. A 5-ounce bottle of shampoo is not allowed, even if you've only used half of it. The rule is based on the container size, not how much liquid is actually inside.

Place the bag in an straightforward-to-reach spot in your carry-on—the front pocket or on top of your other items. When you reach the security checkpoint, remove it before you place your bag on the conveyor belt. This small step prevents delays and keeps the line moving.

What happens if you forget to remove liquids

If you reach the X-ray scanner with liquids still in your carry-on, the TSA officer will see them on the screen and stop the bag. You'll be asked to step aside while they open your bag and inspect the items. This takes extra time and can make you miss your flight if you're running late.

The officer may confiscate any liquid containers that don't meet the 3-1-1 rule. You won't get them back, so a forgotten bottle of expensive moisturizer or cologne is straightforward lost. If you have time before your flight, you can ask the officer where the nearest trash or recycling bin is, remove the item, and resubmit your bag.

Repeated violations or attempts to bring prohibited items can result in additional screening or a citation, though this is rare for a straightforward mistake with liquids.

Liquids in checked baggage have no size restrictions

If you're checking a bag, you can pack full-sized bottles of shampoo, lotion, cologne, or any other liquid without worrying about the 3.4-ounce limit. There is no limit on the amount of liquid you can pack in checked baggage, though airlines may have their own rules about hazardous materials like paint thinner or certain cleaning products.

Packing liquids in checked baggage is a good strategy if you're traveling with items you use daily and don't want to buy travel-sized versions. Just make sure the bottles are sealed tightly so they don't leak onto your clothes during the flight.

Keep in mind that if your flight is short or you're only carrying on a bag, you won't have access to checked baggage during the flight, so you'll need travel-sized versions of anything you want to use mid-flight.

TSA PreCheck and liquids

If you have TSA PreCheck, you do not have to remove liquids from your carry-on bag at security. You also don't have to remove shoes, belts, or light jackets, and you can leave laptops in your bag. This is one of the main conveniences of the program.

However, you still must follow the 3-1-1 rule—your liquids must still be 3.4 ounces or smaller and in a quart-sized bag. The difference is that you don't have to take the bag out and place it in a bin. TSA PreCheck costs $78 to $85 for five years and requires an in-person appointment at a TSA enrollment center.

International travel and liquids

If you're flying internationally, the 3-1-1 rule applies to flights departing the United States. Most countries that have TSA-equivalent security agencies follow the same rule, though some may be stricter. Check with your airline or the airport's website before you travel to another country.

If you're arriving in the United States from another country, you'll go through TSA screening when you land (if you're connecting to a domestic flight) or when you clear customs. The 3-1-1 rule applies at that point as well.

Liquids purchased in duty-free shops after you've cleared security at your departure airport are allowed on the plane in a sealed bag, even if they're larger than 3.4 ounces. Keep the receipt and the sealed bag together so you can show them if asked.

Frequently Asked Questions

Can I bring a full water bottle through TSA security?

No, you cannot bring a full water bottle through security. However, you can bring an empty reusable water bottle and fill it at a water fountain or refill station after you've cleared security. Many airports have these stations near the gates.

Do solid deodorants count as liquids?

Solid stick deodorants do not count as liquids and can be packed in carry-on or checked baggage without restriction. Gel, spray, and cream deodorants do count as liquids and must follow the 3-1-1 rule.

What if my medication is a liquid and it's more than 3.4 ounces?

Liquid medications like insulin, cough syrup, or liquid antibiotics are exempt from the 3.4-ounce limit. Pack them in your carry-on and declare them to the TSA officer at security. You may be asked to open the container for inspection, so keep medications in their original labeled bottles.

Can I pack liquids in my personal item instead of my carry-on?

No, the 3-1-1 rule applies to all bags you bring into the cabin, including personal items like backpacks and purses. Liquids must be in a quart-sized bag regardless of which bag they're in.

Do I need to buy TSA-approved bags, or can I use any clear plastic bag?

Any clear quart-sized plastic bag works—you don't need to buy a special TSA-approved bag. Gallon-sized freezer bags are too large. A standard quart-sized sandwich or storage bag from any grocery store is fine, and the TSA provides them free at checkpoints if you don't have one.