In the USA they do NOT have to be marked. I have mine in unmarked small plastic bottles and have not had any trouble at all at any airport.
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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.
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.
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.
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. Liquids more than 3.4 oz or 100 ml not in a secure, tamper-evident bag must be packed in checked baggage.
Stick deodorant is fine in any size. Well, almost any size… Powders and crystals are good to go as well. Spray, Gel, Liquid, Cream, Pastes, and Roll-On deodorants need to be in containers no larger than 3.4 ounces and placed in a clear quart-sized baggie.
More videos on YouTubeYou are allowed to bring a quart-sized bag of liquids, aerosols, gels, creams and pastes through the checkpoint. These are limited to 3.4 ounces (100 milliliters) or less per item. This is also known as the 3-1-1 liquids rule.
You can take all plug-in phone chargers with you in your carry-on or checked bags with ease as they do not contain any form of battery and, therefore, do not present any danger. Typically, you will not be able to use this type of charger onboard as most airplanes do not have power sockets.
If you want to take perfume on a plane, you need to keep in mind that perfume is considered a liquid and is subject to TSA regulations. The perfume must be in a container that holds no more than 3.4 ounces (100 millilitres), and it should be placed in a clear, plastic, quart-sized bag for screening.