Is 100ml 3.4 oz?

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.



In the context of travel and airport security, 100ml is equivalent to 3.4 fluid ounces. While the exact conversion is approximately 3.3814 fluid ounces, the aviation industry and regulatory bodies like the TSA and EASA standardized the limit to "100ml / 3.4oz" for clarity and ease of communication across different measurement systems. This is the maximum volume allowed for any single container of liquid, gel, or aerosol in a carry-on bag under the "3-1-1" rule. It is important to note that these are US Fluid Ounces; if you were using UK Imperial fluid ounces, 100ml would be roughly 3.5 oz. For 2026 travelers, remember that the "100ml rule" refers to the size of the container, not the amount of liquid inside; a 200ml bottle that is only half full will still be confiscated. However, as more airports upgrade to advanced CT scanners, this 100ml/3.4oz limit is slowly being phased out in certain regions, such as the UK and parts of Europe, where passengers can now carry up to 2 liters in their hand luggage.

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Each passenger may carry liquids, gels and aerosols in travel-size containers that are 3.4 ounces or100 milliliters.

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If you want to bring perfume in your hand luggage, you must comply with the “3-1-1 Rule”. This means that it must be in a container with 3.4 ounces (100 millilitres) or less and placed in a single, clear, plastic, sealable bag for inspection.

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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). The capacity of each container must not exceed 0.5 kg (18 ounces) or 500 ml (17 fluid ounces).

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If your liquids are stored in containers larger than 3.4 ounces, even if there's only 3.4 ounces left inside the bottle, you can't bring them through security. Completely empty bottles, such as your reusable water bottle, are allowed through the TSA checkpoint since (spoiler alert!)

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You must place liquids into individual 100 ml containers and remember that, in most cases, security won't accept larger containers, even if only partly full.

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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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As stated in the TSA liquid regulation, it is the size of the container that counts, not the actual contents. A 125 ml tube of toothpaste that has been half used up is not permitted, but a full 100 ml tube is.

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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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Why was the 100ml liquids rule originally brought in? Liquids in quantities larger than 100ml have been verboten on commercial air travel since 2006 – and like so many flight regulations introduced in the decade following 9/11, it was originally an anti-terrorism measure.

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London City Airport has scrapped the 100ml liquid limit by using high-tech scanners which also allow electronics to be kept in hand luggage at security.

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You must take no more than 100 ml of any liquid on a flight. You must place liquids into individual 100 ml containers and remember that, in most cases, security won't accept larger containers, even if only partly full.

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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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Most airlines let people bring an empty water bottle with a capacity of up to 20 oz. or a container that is 34 oz. or smaller. Containers bigger than this may not be allowed through TSA. Before trying to bring a bigger container through TSA, always check with your airline to make sure what their rules are.

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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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Each passenger may carry liquids, gels and aerosols in travel-size containers that are 3.4 ounces or100 milliliters. Each passenger is limited to one quart-size bag of liquids, gels and aerosols.

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3-1-1 Rule While perfumes and colognes are not inherently hazardous, they are considered dangerous for air travel since they are flammable liquids. If you want to travel with fragrances, you may be allowed to do so in limited quantities. Furthermore, you must pack them properly to take them into the cabin.

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