
There are differing opinions on whether you can take a flask through airport security. According to the Transportation Security Administration (TSA), you can bring an empty thermos flask in carry-on luggage through airport security. It must not contain liquids when you are going through security screening, but it can contain solid foods. Liquids must be in containers smaller than 3.4 oz and packed in a one-quart-sized bag. Alcoholic beverages with more than 24% but not more than 70% alcohol are limited in checked bags to 5 liters per passenger and must be in unopened retail packaging. Alcoholic beverages with 24% alcohol or less are not subject to limitations in checked bags. Some people suggest buying small plastic bottles and transferring the alcohol to a flask after passing security. Others suggest that as long as the liquids are not hazardous, they are fine in checked bags.
| Characteristics | Values |
|---|---|
| Liquids in carry-on luggage | Must be in containers smaller than 3.4 oz and packed in a single quart-size bag |
| Liquids in checked luggage | No limit on volume, but must not be hazardous |
| Alcohol in carry-on luggage | Must be in containers smaller than 3.4 oz and packed in a single quart-size bag |
| Alcohol in checked luggage | Alcoholic beverages with more than 24% but not more than 70% alcohol are limited to 5 liters per passenger and must be in unopened retail packaging. Alcoholic beverages with 24% alcohol or less are not subject to limitations. |
| Solid foods in flasks | Allowed in carry-on luggage |
| Empty flasks | Allowed in carry-on luggage |
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What You'll Learn

Liquids in checked bags
Liquids are permitted in checked baggage, but there are some important considerations to keep in mind. Firstly, research and comply with any restrictions on specific types of liquids. For example, the Transportation Security Administration (TSA) prohibits alcoholic beverages over 140 proof in checked bags. Additionally, certain destinations may have quantity limitations or import regulations for certain liquids. For instance, there may be restrictions on the number of bottles of wine that can be brought into particular U.S. states. It is important to be aware of any such regulations that may apply at your destination.
When packing liquids in checked bags, it is crucial to take precautions to prevent leaks. Tape the tops of bottles or containers to secure the caps, and consider using plastic bags, bubble wrap, or clothing for additional protection. Place liquid items in the centre of your suitcase, surrounded by soft items and clothing, to provide cushioning in case the bag is dropped or crushed.
It is also important to note that checked bags may be inspected by baggage security screeners. Thus, it is recommended to avoid packing valuables or prescription medications in checked baggage.
Regarding alcoholic beverages, the TSA allows up to 5 litres (1.3 gallons) of alcoholic drinks containing more than 24% but not exceeding 70% alcohol in checked bags. These beverages must be in unopened retail packaging. Alcoholic drinks containing 24% alcohol or less are not subject to quantity limitations in checked luggage.
In summary, while there may not be official quantity restrictions on liquids in checked bags, careful packing and adhering to specific liquid type restrictions are essential.
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TSA liquid rules
The Transportation Security Administration (TSA) has strict rules regarding liquids, gels, and aerosols in carry-on luggage. The TSA liquid limit, also known as the 3-1-1 rule, restricts liquids to containers of 3.4 ounces (100 ml) or less. These containers must fit into a single, quart-sized, clear, resealable bag. This rule also applies to creams, pastes, and other substances that fall under the technical category of LAGs (liquids, aerosols, and gels).
While the 3-1-1 rule is a general guideline, there are some exemptions. Medically necessary liquids, such as prescription medications, breast milk, and baby formula, are allowed in larger amounts but must be declared to security officers first. It is recommended that these liquids be transported in clear or translucent bottles for easier screening. Additionally, live fish, live coral in water, and even eggs with liquid yolks are exempt from the 3-1-1 rule but require proper inspection.
For alcoholic beverages, the rules differ depending on the alcohol content and whether they are in checked bags or carry-on luggage. Alcoholic drinks with more than 24% but not exceeding 70% alcohol are limited to 5 liters per passenger in checked bags and must remain unopened. Alcoholic drinks with 24% alcohol or less are not subject to quantity restrictions in checked bags. For carry-on luggage, mini bottles of alcohol must fit comfortably into a single quart-sized bag.
While the TSA liquid rules are still in effect, there is a possibility that they may be lifted in the coming years with the introduction of advanced scanners that can detect hazardous liquids using 3-D imaging technology. Until then, it is recommended to adhere to the liquid restrictions and pack any larger liquids in checked baggage to avoid delays or additional screenings.
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Alcohol allowance
For carry-on luggage, the TSA liquids rule applies to alcohol. This means that alcoholic beverages with more than 24% but not more than 70% alcohol are limited to 5 litres per passenger and must be in unopened retail packaging. Alcoholic beverages with 24% alcohol or less are not subject to limitations in checked bags. Mini bottles of alcohol must be able to fit comfortably into a single quart-sized bag.
For checked luggage, there is no limit on how much alcohol you can bring, as long as it is not above 140 proof (70% ABV). However, it is important to note that the final decision on whether an item is allowed through the checkpoint rests with the TSA officer.
Some people choose to bring empty flasks onto the plane and fill them with their own alcohol after passing through security, as this allows them to avoid the liquid restrictions for carry-on luggage. It is worth noting that while some people report being able to consume their own alcohol on the plane without issue, it is technically prohibited by the FAA.
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Airline regulations
When it comes to checked luggage, most airlines and security authorities, such as the TSA, do not have an issue with flasks as long as they are empty or contain non-hazardous liquids. Some people have reported taking gallons of alcohol in their checked luggage without any issues. However, it is always good to check with your specific airline, as their policies may vary.
The regulations for carry-on luggage are more strict. The TSA's liquids rule prohibits flasks containing liquids from being taken through airport security. An exception to this rule is if the flask contains solid food, in which case it is permitted. It is important to note that soups and stews are not considered solid foods. Additionally, any liquids, including alcoholic beverages, must be in containers smaller than 3.4 ounces (100 ml) and must fit comfortably into a single quart-sized bag. These regulations are in place to ensure the safety and security of passengers and staff during flights.
Some people have reported getting around these restrictions by transferring alcohol into a flask after passing through security or by using \"suntan lotion\" flasks. However, it is important to note that consuming personal alcohol on an aircraft is prohibited by FAA regulations, and flight attendants are not permitted to serve intoxicated passengers. Ultimately, while some people may choose to sneak alcohol onto flights, it is a violation of federal law, and the final decision on whether to allow an item through security rests with the TSA officer.
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Solid foods
Thermos flasks or vacuum flasks are allowed through security, but they must be empty of liquids. They can, however, contain solid foods, such as hot solid food in a stainless-steel thermos food container. Soups and stews are not permitted in thermos flasks.
It is important to note that food items containing liquids or gels must follow the 3-1-1 rule, which allows containers holding 3.4 ounces or 100 ml or less of liquid or gel in a clear, quart-sized bag.
While solid foods are allowed, it is recommended to pack them in checked baggage to avoid hold-ups during screening, as food can block X-ray images or be mistaken for suspicious items. Additionally, 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, appears tampered with, or poses security concerns.
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Frequently asked questions
Yes, you can bring an empty flask in your carry-on luggage through airport security. It must not contain liquids when you are going through security screening, but it can contain solid foods. You can fill the flask after you have passed through security.
Alcoholic beverages with more than 24% but not more than 70% alcohol are limited in checked bags to 5 liters per passenger and must be in unopened retail packaging. Alcoholic beverages with 24% alcohol or less are not subject to limitations in checked bags. For carry-on luggage, mini bottles of alcohol must be able to fit comfortably into a single quart-sized bag.
The TSA will likely confiscate the liquid. If the liquid is alcohol, you can purchase some after passing through security and pour it into your flask.











































