Can I travel with a 3.4 oz bottle?

You are allowed to bring a quart-sized bag of liquids, aerosols, gels, creams and pastes in your carry-on bag and through the checkpoint. These are limited to travel-sized containers that are 3.4 ounces (100 milliliters) or less per item.



Yes, you can travel with a 3.4 oz (100ml) bottle in your carry-on luggage in 2026, as the "3-1-1" rule remains the baseline for TSA and most international security agencies. However, the experience is shifting. While many U.S. airports still require you to place these bottles in a single quart-sized clear bag and remove them for X-ray, dozens of major global hubs (including several in the UK and Europe) have installed Next-Generation CT scanners. These new scanners allow you to keep your 3.4 oz bottles—and sometimes even larger liquids up to 2 liters—inside your bag. Despite these upgrades, the safest practice in 2026 is still to adhere to the 3.4 oz limit, as you may encounter older security technology on return flights or at smaller regional airports that haven't yet modernized their equipment.

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A terrorist plot named the 2006 Transatlantic Liquid Bomb Plot is why we have the 3.4-ounce limit in place for bringing liquids on airplanes. The plot involved a group of people carrying liquid explosives to assemble bombs in the air. Had they succeeded with the plan, at least 1,500 people would have died.

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Shop The Article. In short, you are allowed to bring a reusable water bottle through the TSA checkpoint of an airplane, no matter the material, as long as it is empty. Once your empty bottle has gone through security, you can fill it up at a refilling station and bring your full water bottle onto the plane.

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These are limited to travel-sized containers that are 3.4 ounces (100 milliliters) or less per item. Placing these items in the small bag and separating from your carry-on baggage facilitates the screening process. Pack items that are in containers larger than 3.4 ounces or 100 milliliters in checked baggage.

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It seems to be very minor difference in size, not noticeable to naked eye. 4oz is over the limit. Although it doesn't seem by much, it is still over and chances are it will be confiscated at security. They will probably notice if your bottles are over 100ml.

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The TSA's liquid limit for carry-ons—known as the 3-1-1 rule—allows travelers to pack liquids, aerosols, gels, creams, and pastes under 3.4 ounces (100 milliliters) in their carry-on bags. Passengers are allowed up to one quart-sized bag per person, or roughly nine 3.4-ounce containers in a single quart-sized bag.

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The 3-1-1 rule has three components: One person, one quart-sized bag, and 3.4-ounce containers. According to the TSA liquid carry-on rules 2021, you have to put your liquids in 3.4-ounce containers, and place the containers inside a one-quart bag. Additionally, only a single quart-sized bag is allowed per person.

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Deodorant And Antiperspirant Sizes For example, many stick deodorants and antiperspirants come in sizes under 3.4 ounces, so it's fine to bring in your carry-on bag. However, roll-ons tend to be larger, meaning they must be packed in checked luggage.

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Perfume rules for carry-on bags The TSA's “3-1-1 rule” clearly states that passengers can only travel with liquids, gels and aerosols in carry-on luggage in small containers that do not exceed 3.4 ounces (100 milliliters).

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You are allowed to bring a quart-sized bag of liquids, aerosols, gels, creams and pastes in your carry-on bag and through the checkpoint. These are limited to travel-sized containers that are 3.4 ounces (100 milliliters) or less per item.

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For carry-on, same rules apply as above. You are limited to containers of 3.4oz or less that fit in your quart-sized bag. For checked bags you are limited to five liters per passenger. However, it must be in unopened retail packaging!

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Firearms, ammunition, and fireworks are prohibited, as are all knives and safety razors (including pocket knives and Swiss Army knives). Straight razors and replacement blades for straight razors are also not allowed. Most tools also cannot be packed in carry-on luggage, as they have the potential to cause harm.

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Is Mascara Considered a Liquid by TSA? TSA counts mascara as a liquid, so the 3-1-1 rule for packing it in hand luggage applies. It states that all liquids have to be in 3.4 oz (100 ml) bottles or smaller and packed in a 1-quart bag. Mascara usually isn't above 3.4 oz, so you're free to pack it in your hand luggage.

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The FAA limits the total amount of restricted medicinal and toiletry articles, including aerosols, in checked baggage. The total aggregate quantity per person cannot exceed 2 kg (70 ounces) or 2 L (68 fluid ounces).

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But what are they, and is deodorant considered a liquid when flying? Deodorant can be considered a liquid when flying if it is in a gel or aerosol form. If your deodorant is solid, though, the TSA will let you bring a standard stick of solid deodorant with you in your carry-on luggage.

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Safety Razors: Because the razor blades are so easy to remove, safety razors are not permitted in your carry-on luggage with the blade. They're fine to pack in your carry-on without the blade. The blades must be stored in your checked luggage. The same applies for straight razors.

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Toothpaste and Air Travel - Key Takeaways Toothpaste can be included in your carry-on luggage in a container that is 3.4oz (100ml) or smaller and abides by other 3-1-1 rules. You cannot bring a regular or full size tube of toothpaste in your carry-on.

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As frequent travelers are well aware, bottles that are 3.4 ounces or less can be stashed into a single one-quart plastic bag, and each traveler is allowed one—in a rule that's been dubbed the 3-1-1 liquids rule. Oversized liquids can still be packed, but need to go into checked-in baggage.

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In response, officials banned liquids altogether and then, after laboratory testing here and abroad, came up with the formula of limiting liquids and gels to three-ounce containers in a single quart-size bag ?as a way to allow for people who wanted to bring liquids on board,? Mr. Hawley said.

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