Since 2006, the Transportation Security Administration has required all liquids in your carry-on luggage to be 3.4 ounces, be packed in a clear quart-size bag, and with a limit of one bag per traveler.
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Current TSA regulations allow liquids, aerosols, gels, creams and pastes that are under 3.4 oz.and 100 ml to be carried through TSA security checkpoints. These items must be packed in 1 quart-sized, resealable bag and each passenger is limited to 1 bag.
Liquids, aerosols and gels (LAGs) are all liquid items for aviation security purposes. This includes all drinks, toiletry and cosmetic items such as shampoo and shower gel, toothpaste, liquid/aerosol deodorant, hairspray, hair gel, mascara and foundation cream.
A report produced for the United Nations Environmental Programme in 2020 found a thick and durable polypropylene (PP) bag (they often have a woven feel) must be used for an estimated 10 to 20 times compared to one single use plastic bag, while a slimmer but still reusable polyethylene (PE) bag five to 10 times.
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.
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.
TSA considers tweezers to be completely safe, so they're allowed on planes. You can pack tweezers in hand or checked baggage without any packing restrictions. But TSA doesn't allow packing sharp objects in hand baggage because some of them could be used as potential weapons.
As a guide, anything larger than A5 size or an iPad mini needs to be placed in a tray with nothing covering it up. If you can spray, spread or pour something at room temperature, it counts as a liquid in aviation security terms. This includes aerosols such as asthma inhalers and foodstuffs, like butter or jam.
The ban was put in place after British authorities thwarted a plan to blow up a U.S.-bound plane with liquid explosives. There is now technology to send that ban down the drain. Airports across the U.S. are now using X-ray scanners that use CT technology to give guards a 3-D image of your carry-on.
Nail clippers are also allowed on planes, according to the Transportation Security Administration (TSA). You can pack them in both your carry-on and checked luggage. Similar to tweezers, it's a good idea to wrap your nail clippers or place them securely in a bag to avoid injury to others handling your luggage.
Solid food items (not liquids or gels) can be transported in either your carry-on or checked baggage. TSA officers may instruct travelers to separate items from carry-on bags such as foods, powders, and any materials that can clutter bags and obstruct clear images on the X-ray machine.
TSA has a limit on the size of liquids, gels and aerosols that travelers can bring in their carry-on bags. It's called the 3-1-1 liquids rule. Each item must be 3.4 ounces or less and must be able to fit inside a one-quart size clear zip-top bag.