
Airport security regulations regarding drinks can be confusing. While the rules vary slightly depending on your location and destination, there are some general guidelines to follow. For most liquids, the 3-1-1 rule applies: liquids must be in containers of 3.4 ounces (100ml) or less and placed in a clear, quart-sized bag. This includes water, coffee, juice, and alcohol. An exception is made for baby food and drink, breast milk, and prescription medicines, which are allowed in larger quantities. Additionally, items like ice and frozen solids are permitted as they are not considered liquids. Ultimately, the final decision rests with the TSA officer, and it is always best to check the latest regulations before your travel.
| Characteristics | Values |
|---|---|
| Container size | 3.4 oz or 100ml |
| Container type | Clear, resealable plastic bag |
| Container capacity | 1L |
| Exceptions | Baby food/drink, breast milk, prescription medicines, essential non-prescription medicines, COVID-19 test kits, gel and ice packs for injuries or to refrigerate baby food/drink |
| Frozen items | Allowed if frozen solid |
| Final decision | Rests with the TSA officer |
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What You'll Learn

Liquids under 3.4oz are allowed through security
Liquids under 3.4oz are allowed through airport security, as long as they are placed in a clear, quart-sized bag. This is known as the 3-1-1 rule. Liquids include gels and aerosols, and these must be in containers of 3.4 oz or 100ml or less. All containers must fit into a single clear, plastic bag, which should be resealable and no more than 1L in capacity.
This rule applies to water, coffee, juice, and alcohol. It also includes foods such as soft cheese and hummus, as well as personal items like toothpaste and shampoo. Baby food, milk, liquid formula, water, juice, and breast milk are allowed in quantities greater than 100ml for babies under two years of age.
It is worth noting that even if an item is generally permitted, it may be subject to additional screening if it triggers an alarm, appears tampered with, or poses security concerns. The final decision on whether an item is allowed through rests with the TSA officer.
To make your security screening experience as smooth as possible, it is important to plan ahead and pack properly. This includes being aware of any restrictions or guidelines for liquids and knowing what items are prohibited.
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Baby food/drink is exempt from liquid restrictions
Baby food and drinks are essential when travelling with infants and young children. While airport security has strict rules about liquids, baby food and milk are exempt from the usual liquid restrictions. This exemption is in place to ensure that parents and caregivers can adequately feed babies and young children during their travels.
When travelling with babies, it is important to be aware of the specific rules and guidelines around bringing baby food and drink onto a plane. While the restrictions are relaxed for baby food and drink, there are still some guidelines to follow. Baby food and milk are allowed through security and onto the plane, and this includes both homemade and store-bought items. It is worth noting that water for baby formula is also allowed through security, so caregivers can prepare formula as needed.
The rules around baby food and drink are designed to allow parents and caregivers to bring enough food for the duration of their trip. This means that it is possible to bring multiple containers of baby food and milk, and these do not need to be presented in a clear bag like other liquids. However, it is important to declare these items to the TSA officer at the checkpoint. While baby food and drink are exempt, they may still be subject to additional screening if they trigger an alarm or appear tampered with.
It is recommended that baby food and drink are clearly labelled and kept separate from other liquids or food. This helps with the screening process and ensures a smooth experience when passing through security. Caregivers should also be prepared to open and taste baby food or milk if requested by a TSA officer, which is a standard procedure to ensure the safety of all passengers. By following these guidelines, parents and caregivers can ensure they are prepared when travelling with babies.
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Frozen liquids are allowed if solid at screening
Frozen liquids are allowed through airport security if they are completely frozen solid when presented for screening. If the frozen liquid item has partially melted and turned slushy, or has any liquid at the bottom of the container, it will not be permitted and must adhere to the 3-1-1 liquids requirements. This means that the container must be no larger than 3.4 oz or 100 ml in volume and must be placed in a clear, closed, resealable plastic bag no more than 1L in capacity.
It is important to note that even if an item is generally permitted, it may be subject to additional screening or not allowed through the checkpoint if it triggers an alarm during the screening process, appears to have been tampered with, or poses other security concerns. The final decision rests with the TSA officer on whether an item is allowed through the checkpoint.
Additionally, according to Australian regulations, for a liquid, aerosol, or gel (LAG) to be considered a solid, it must be solid at room temperature. This means that frozen liquids, which are liquid at room temperature, are still subject to the 100 ml rule in Australia.
To avoid any issues, it is recommended to pack any liquids or frozen liquids in checked baggage if you are unsure about the restrictions.
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Alcohol is restricted to being served by crew members
While you can bring drinks through airport security, there are some important restrictions to be aware of, especially regarding alcohol. Alcohol is restricted to being served by crew members, and there are strict rules around bringing your own alcohol on board.
Firstly, it's important to note that only mini bottles of alcohol are permitted in carry-on luggage, and these must adhere to the liquid restrictions in place at most airports. This means that any liquid, including alcoholic beverages, must be in containers of 3.4 ounces (100 ml) or less. All containers must then fit into a single, clear, quart-sized (1 litre) bag. These restrictions are in place at TSA checkpoints in the US, as well as at CATSA checkpoints in Canada.
If you are travelling with an infant under two years of age, these liquid restrictions do not apply to baby food, milk, formula, water, or juice. Breast milk is also permitted in quantities over 100 ml, whether the parent is travelling with their child or not.
While you can bring small quantities of alcohol with you through security, it is worth noting that drinking your own alcohol on board the plane is prohibited. Alcoholic beverages are only permitted to be consumed if they are served by a crew member. Therefore, it is recommended that passengers refrain from bringing their own alcohol on board and instead purchase drinks from the in-flight menu.
In addition to the liquid restrictions, it is important to remember that all items brought through security must not pose any security concerns. Even if an item is generally permitted, it may be subject to additional screening or confiscation if it triggers an alarm, appears tampered with, or raises other security issues. Ultimately, the decision of whether an item is allowed rests with the TSA or CATSA officer at the checkpoint.
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Prescription medicines are allowed through security
If you are carrying prescription medication, it is advisable to bring only what you need for the flight in your carry-on bag. However, travel experts recommend taking all doses of medication you need for your trip in your carry-on, as checked baggage can be difficult to access mid-flight and medication occasionally disappears from these bags.
Prescription drugs and other medically required liquids are allowed through security and onto flights. You may place liquid medications in 3.4-ounce (100ml) bottles in a clear, one-quart-sized zip-top bag, along with other personal liquids and gels. If your liquid prescription medication comes in larger containers, pack them separately in your carry-on. Reasonable quantities of liquid medications are allowed and do not need to be placed in a zip-top bag, but you must inform a TSA official at the start of the screening process. They may ask you to open the container for inspection and testing.
You may wish to bring a doctor's note, original prescription bottles, or other documentation to make the screening process quicker. You will need to present these items to a security officer separately. If your medically necessary liquids cannot be opened or X-rayed, you will still be able to bring them, but you will probably have to undergo a pat-down screening.
The UK government requires proof, such as a letter from a doctor or a copy of a prescription, for liquid medications over 100ml. No proof is needed for medicines in tablet form or liquids in a container of 100ml or less. Controlled substances like cannabis, codeine, fentanyl, and testosterone must be accompanied by a letter of proof that the medicine was prescribed to the traveler. This letter must include the traveler's name, dates of travel, the prescribing person's signature, and a list of the medications with amounts and dosages.
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Frequently asked questions
Only drinks in containers of 3.4oz or 100ml or less can be taken through airport security. These containers must be placed in a clear, quart-sized bag.
Yes, baby food/drink, milk, liquid formula, water, juice, and breast milk are allowed in quantities greater than 100ml or 3.4oz if you are travelling with a baby younger than two years of age.
No, the FAA restricts passengers from drinking alcohol on board planes unless it is served by a crew member.











































