Why do they put duty-free in a sealed bag?

Official Security Bags These are sealed clear plastic bags with special security features that hold goods purchased from airline or airport retailers after security screening. They are designed to make it easier for you to carry liquids, aerosols and gels through screening.



In 2026, duty-free liquids like spirits or perfumes are placed in a Security Tamper-Evident Bag (STEB) to comply with international ICAO safety standards. The primary function of the STEB is to prove to security officers at connecting airports that the contents were purchased in a secure "sterile" zone and have not been tampered with or replaced with hazardous substances. Each bag contains a unique serial number and a receipt visible from the outside. If you have a layover, a sealed STEB allows you to carry liquids exceeding 100ml through transit security checkpoints without surrendering them. However, if the seal is broken or the bag is opened before you reach your final destination, the "chain of custody" is considered compromised, and security agents will likely confiscate the item during your transit screening.

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You may carry duty free liquids in secure, tamper–evident bags, more than 3.4 oz or 100 ml in your carry-on bag if: The duty free liquids were purchased internationally and you are traveling to the United States with a connecting flight.

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International airports have duty-free shops that carry luxury goods—but watch out for potentially high markups on the products. In the U.S., you must fill out a U.S. Customs Form, often during your flight home, to declare any purchases made abroad.

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You Can Shop Duty-Free On Arrival Some countries allow arriving international travelers to use duty-free shops before leaving the airport, but the U.S. does not. Returning U.S. travelers can buy duty-free only at foreign departure airports.

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Generally, customs officers may stop people at the border to determine whether they are admissible to the United States, and they may search people's belongings for contraband. This is true even if there is nothing suspicious about you or your luggage.

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Travelers should declare all items being brought from abroad that will remain in the United States. This includes gifts and duty-free purchases. Goods purchased in a duty-free shop are not automatically free of duty upon your return to the United States.

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Typically in economy, you can bring one carry-on and one personal item. If you bring two bags, one must fit underneath your seat and the other can go into the overhead bin. If you're flying in an upgraded class like business or first, you may be allowed an additional carry-on bag.

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Illegal drugs and narcotics, as these are strictly prohibited by law in most countries. Firearms and ammunition, as well as any replicas or imitations. Explosives and flammable items, such as fireworks, gas, and aerosols. Poisonous and toxic substances, including pesticides and certain chemicals.

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Is toothpaste considered a liquid by the TSA? Yes, toothpaste must adhere to the 3-1-1 rule for liquids and gels. Toothpaste can be brought through TSA security in your carry-on as long as it is 3.4 ounces (100 milliliters) or less and placed in a 1-quart bag.

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