Why does TSA only allow 3.4 oz?

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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Any item that alarms or is unable to be screened will not be permitted in your carry-on bag. We recommend packing all liquids, gels, and aerosols that are over 3.4 oz or 100 ml in your checked baggage, even if they are in a secure, tamper-evident bag.

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Yes, toothpaste is considered a liquid when flying and must be within the 3.4oz (100ml) limit for liquids in order to bring it in your carry-on bag. Any amount larger than that must be checked with your luggage.

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Because the TSA considers the nut spread a liquid, plane passengers must limit the amount they bring in their carry-ons. Like all other liquids, passengers are limited to 3.4 oz or less of peanut butter in their carry-on bag, but can also put the snack in their checked baggage.

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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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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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liquids must be in a quart size baggie, not a little fold over sandwich baggie and not a gallon size baggie.

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Anything more will have to go in a checked bag or risk being tossed out. 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.

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For example, classic stick deodorant doesn't have any limitations, so you're free to pack whatever size you want. Liquids and semi-liquids, on the other hand, are subject to restrictions. This includes many of the popular alternatives to stick deodorant: Roll-On Deodorants and Antiperspirants.

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You may not be nuts about it, but TSA considers your PB a liquid. In carry-on, it needs to be 3.4oz or less, the TSA said via posts on Twitter and Instagram. The agency says peanut butter fits its definition of liquid, which it declares as something with no definite shape that takes the shape of its container.

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What is not allowed on a plane in carry on baggage: the short version
  • Liquids over 3.4 ounces (100ml) or liquids that do not fit in your one permitted liquids bag.
  • Sharp objects.
  • Flammable liquids or other flammable items.
  • Guns.
  • Weapons.
  • Self defense items.
  • Safety razors or straight razors.
  • Swords.


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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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TSA Isn't Very Strict About Quart Size Bags
If the bag is transparent, resealable, and doesn't look much larger than a 1-liter Ziploc bag, it will be allowed. You'll only encounter problems if your toiletry bag looks way too large or if you encounter a very strict officer, but this happens rarely.

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Yes, Vaseline is considered a liquid item by the TSA, as it is a gel-like, creamy substance. So, you need to adhere to the TSA liquid limit while packing it in your cabin baggage. If you have large bottles or containers of Vaseline, they can be packed in your checked baggage, but within reasonable limits.

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Yes, you can take tweezers on a plane and pack them in your carry-on and/or checked bag. It's beneficial to pack them properly to avoid any inconvenience.

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3 – Liquids, gels, and lotions must be in a container that is 3.4 ounces (100ml) or less (by volume). 1 – All of your items should fit into a 1-quart clear, plastic, zip top bag.

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