TSA Liquid Limit: Carry-On Liquid Rules and Packing Tips

The TSA liquid limit is based on container size, not how much product remains inside. Most liquids, gels, creams, pastes and aerosols in carry-on baggage must be in containers of 3.4 fluid ounces (100 milliliters) or less, and all containers must fit inside one clear quart-size bag. Medical liquids, infant feeding items and certain duty-free purchases may exceed that limit, but they must still be declared and screened.

How Does the TSA 3-1-1 Liquids Rule Work?

The TSA 3-1-1 rule allows each passenger to carry liquids in containers of 3.4 fluid ounces or 100 milliliters or less, packed together in one clear, quart-size, resealable bag inside their carry-on luggage. The rule applies to the container’s marked capacity rather than the amount currently inside it.

Containers of 3.4 Fluid Ounces or 100 Milliliters or Less

Each standard liquid, gel, cream, paste or aerosol container must hold no more than 3.4 fluid ounces or 100 milliliters. Travel-size shampoo, toothpaste, liquid foundation, sunscreen and similar products can go in the carry-on when they meet this limit.

The rule applies to each individual container. Several compliant containers are allowed, provided they all fit into the permitted liquids bag.

One Clear, Quart-Size, Resealable Bag per Passenger

All standard liquid containers must fit inside a single clear, quart-size, resealable bag, and the bag must close normally. Containers stacked above the zipper or forcing the sides apart may be rejected during screening.

The allowance is one liquids bag per passenger, not one bag per piece of cabin baggage. Carrying both an overhead carry-on and a personal item does not provide a second liquids allowance.

Container Capacity Matters More Than the Amount Left Inside

A 6-ounce bottle containing only 2 ounces of shampoo is still too large for the standard liquids bag because the container can hold more than 3.4 ounces. Transfer the amount needed into a compliant travel bottle or place the larger container in checked baggage when permitted.

Partially empty toothpaste tubes, sunscreen bottles and cosmetic containers are assessed in the same way. The capacity printed on the packaging is more important than an estimate of what remains.

Which Everyday Items Count as Liquids?

TSA treats many spreadable, squeezable and pourable products as liquids even when travelers may not describe them that way. The product’s form at the checkpoint generally determines whether the 3-1-1 rule applies.

If an item can be poured, spread, squeezed or sprayed, treat it as a liquid when preparing for screening. Most of these items must follow the 3-1-1 rule, but certain medically necessary, infant-feeding and duty-free liquids may exceed the standard size limit when specific conditions are met. These exceptions still need to be declared and screened.

Which Liquids Can Exceed the Standard TSA Limit?

Some necessary liquids may be carried in quantities above 3.4 ounces and do not have to fit inside the quart-size bag. An exception changes the quantity allowance, but it does not remove the declaration or screening requirement.

Medically Necessary Liquids

Medically necessary liquids, gels and aerosols may be carried in reasonable quantities for the trip, even when individual containers exceed 3.4 ounces. This can include liquid medication and supplies needed to keep medication safe or usable.

Tell the TSA officer about these items before screening begins and remove them from the carry-on when requested. They may receive additional inspection, which can include X-ray screening, testing the container’s exterior or asking the passenger to open it. Keeping medication clearly labeled can make the process easier, although TSA does not require medication to be in a prescription bottle.

Pack only a reasonable travel quantity and allow extra time at the checkpoint. If you do not want a medically necessary liquid opened or X-rayed, tell the officer before screening so alternative procedures can be discussed.

Breast Milk, Formula and Baby or Toddler Food

Breast milk, formula, toddler drinks and baby or toddler food may exceed 3.4 ounces in reasonable quantities. They do not need to fit inside the standard quart-size bag, and parents do not have to be traveling with the child to carry breast milk.

Inform the officer at the beginning of screening and separate these items from the rest of the carry-on. Bottles or containers may require additional inspection. Cooling accessories such as ice packs, freezer packs and gel packs used for these items may also be screened.

The exception does not mean the items can remain hidden inside a packed bag or pass without inspection. Keeping feeding supplies together makes them easier to present without disturbing clothing or other belongings.

Duty-Free Liquids on International Connections

Liquids larger than 3.4 ounces may be allowed when they were purchased duty-free on an international journey and the passenger is connecting through the United States. The items generally need to remain in a transparent, secure, tamper-evident bag provided by the retailer, with a receipt showing that the purchase was made within the permitted time before screening.

Do not open the sealed bag before completing the connection. The liquids may still undergo additional screening, and an item that cannot be cleared may not be allowed through the checkpoint. Rules at airports outside the United States can differ, so check the requirements for every country and connection on the itinerary.

How Should You Pack Toiletries for TSA Screening?

Good toiletry packing separates checkpoint compliance from organization at the destination. Before organizing the rest of your luggage, prepare the clear liquids bag first, then arrange solid products, grooming tools and other bathroom items around how they will be used. 

Choose Only the Liquids You Need

Estimate how much shampoo, skincare, toothpaste and other products the trip will realistically require. The 100-milliliter limit is a maximum container capacity, not a target that every bottle needs to reach.

A short trip may require only a small portion of a full travel bottle. Reducing the number and size of products leaves more room for items that cannot be replaced easily at the destination.

Use Smaller Containers and Solid Alternatives

Transfer products into smaller, clearly identifiable containers based on the actual length of the trip. Solid shampoo, bar soap, stick sunscreen and solid deodorant can reduce pressure on the liquids bag when those formats work for your routine.

If everything still does not fit, remove duplicate products, use toiletries supplied by the accommodation or place permitted full-size bottles in checked luggage. Checked baggage allows larger quantities of many toiletries, but its additional space does not override restrictions on aerosols and hazardous liquids.

The broader rules covering what is not allowed in an airplane carry-on should be checked separately before moving an item between cabin and checked baggage. Some products are restricted in both, while spare lithium batteries and power banks must remain in the cabin.

Separate the Liquids Bag From Other Toiletries

Place all products subject to the 3-1-1 rule in the clear quart-size bag. Toothbrushes, solid toiletries, wipes and other dry items can then go into a separate organizer instead of occupying limited liquids-bag space.

For a short trip, the BAGSMART Paz 2L Dopp Kit provides up to five organizer pockets for dry toiletries and grooming items. Elastic bottle bands and a front zip pocket help separate small essentials and keep frequently used items accessible. It does not replace the TSA liquids bag, which should remain separate and easy to remove.

Secure Bottles and Organize Toiletries for the Stay

Travelers carrying a more complete toiletry routine can organize the remaining items after the clear liquids bag is ready. Pack bottles upright where possible, tighten every cap and use a small protective pouch around products likely to leak.

The BAGSMART Blast 4.5L Hanging Toiletry Bag uses elastic bands to hold bottles, along with transparent zippered compartments and mesh pockets for separating different items. At the destination, its 360-degree rotating hook allows the bag to hang from a bathroom rod or rack, which can reduce clutter when counter space is limited. The clear TSA liquids bag still needs to be packed and presented separately.

Keep the Liquids Bag Easy to Remove

Place the quart-size bag near the top of the carry-on or inside an accessible pocket rather than beneath shoes and clothing. Although screening procedures can vary by airport and equipment, easy access helps when an officer asks for liquids to be removed.

Keeping screening items accessible is an important part of packing a carry-on efficiently. It reduces the need to move clothing, shoes and organizers simply to retrieve the liquids bag at the checkpoint.

Medically necessary liquids and infant feeding items should also remain accessible, but keep them separate from the standard 3-1-1 bag. This makes it clear which products use an exception and need to be declared.

Conclusion

The simplest way to avoid problems at the checkpoint is to judge every product by its form and container capacity before packing. Standard liquids belong in containers of 3.4 ounces or less inside one quart-size bag, while medical, infant-feeding and qualifying duty-free liquids should be packed separately for declaration and additional screening. Bring only the amount the trip requires and use solid alternatives where practical. Keeping the TSA liquids bag separate from a well-organized toiletry bag makes screening easier while keeping the rest of your toiletries ready to use throughout the trip.

FAQ

Does TSA PreCheck Allow Larger Liquid Containers?

No. TSA PreCheck does not provide a larger standard liquids allowance. Regular toiletries must still follow the 3-1-1 rule, while medically necessary liquids and other recognized exceptions follow their separate screening procedures.

Can You Bring an Empty Water Bottle Through TSA?

Yes. An empty water bottle can pass through the checkpoint and be filled afterward. The bottle should be completely empty when presented for screening.

Can Frozen Liquids Go Through Airport Security?

Frozen liquids can generally pass through screening when they are completely frozen solid. If they are partially melted, slushy or contain liquid at the checkpoint, the standard 3-1-1 limit applies unless the contents qualify for an exception.

Do TSA Liquid Rules Apply to International Flights?

TSA rules apply when departing from or passing through a TSA checkpoint in the United States. Other countries may use similar limits but can have different procedures, so check the security rules for each departure and connecting airport.

What Happens if Your Liquids Do Not Meet TSA Requirements?

A noncompliant item may need to be placed in checked baggage, returned to someone outside security, mailed where that service is available or surrendered at the checkpoint. Arriving early provides more time to choose an alternative instead of discarding the product.