Every year, TSA officers seize hundreds of thousands of prohibited items from travelers who are unaware that they are breaking the law.
Flying in the U.S. means following strict rules set by the Transportation Security Administration (TSA). These laws keep passengers safe, but many travelers still pack items that are banned, sometimes without realizing it. Even everyday things can be illegal or require special permission.
If TSA officers find prohibited items at security, you may face fines, delays, or confiscation. To avoid trouble, it’s smart to know what’s off-limits before you head to the airport. Here are 12 items you’re not legally allowed to carry on a plane.
Martial Arts Weapons
Nunchucks, throwing stars, and similar martial arts items are prohibited in carry-on luggage. Even if they’re for sport or display, they must be checked. TSA treats these like other dangerous weapons because they can cause serious harm on board.
Guns and Ammunition
Loaded firearms are banned in carry-ons. Travelers may only transport unloaded guns in checked bags, inside hard-sided, locked cases, and must declare them to the airline upon check-in. Ammunition must also be stored properly. The TSA found 6,737 firearms in carry-ons in 2023, and 93% of them were loaded. Violators risk civil penalties or arrest.
Explosives and Flammable Materials
Items such as fireworks, flares, blasting caps, and flammable paints are strictly prohibited in both carry-on and checked bags. Even small novelty fireworks can trigger legal action. These rules protect passengers from fire hazards and mid-air explosions.
Self-Defense Sprays
Pepper spray and mace are prohibited in carry-on luggage. Travelers may pack one container (under 4 ounces) in checked luggage, but only if it has a safety mechanism. Sprays labeled “tear gas” are banned altogether. Carrying these in the cabin can result in fines or arrest.
Knives and Blades
Most knives, including pocket knives, are prohibited from being carried in carry-on luggage. Only plastic or round-bladed butter knives are allowed. Knives must go in checked bags. TSA confiscates thousands of blades each year from travelers who forget to remove them.
Certain Tools
According to FederalRegister.gov, tools exceeding 7 inches in length, such as crowbars, drills, or hammers, are prohibited in carry-ons. They’re allowed in checked bags. Even shorter tools may be confiscated if officers deem them dangerous.
Liquids Over 3.4 Ounces
The 3-1-1 rule prohibits liquid containers exceeding 3.4 ounces in carry-on bags. This includes water bottles, shampoo, and other personal care products. Travelers must place small containers in a single quart-sized bag. The TSA allows larger amounts of medically necessary liquids but requires them to undergo screening.
Hoverboards
Many airlines ban hoverboards in both carry-on and checked luggage due to the presence of lithium-ion batteries. These batteries have caused fires mid-flight. The TSA advises travelers to check airline rules before packing any battery-powered devices for transport.
Alcohol Over 140 Proof
Liquor over 70% alcohol content (like grain alcohol) is banned in carry-ons and checked bags. TSA allows limited amounts of lower-proof alcohol in unopened retail packaging. Violating these rules can result in confiscation and fines.
Recreational Marijuana
Even in states where marijuana is legal, carrying it through TSA security is illegal under federal law, according to the Marijuana Policy Project. TSA refers marijuana cases to local law enforcement. Some airports have amnesty boxes for travelers to discard marijuana before screening.
Dry Ice
The Federal Aviation Administration allows dry ice only in limited quantities (under 5.5 pounds) and only in properly vented containers. It must be declared to the airline. Excessive dry ice is prohibited because it can release hazardous carbon dioxide gas during flight.
Banned Batteries
Loose lithium batteries over 100 watt-hours are banned in checked bags. Some oversized power banks or camera batteries fall under this rule. Travelers must carry smaller spare batteries in their carry-ons and protect terminals to prevent short circuits.
Disclaimer – This list is solely the author’s opinion based on research and publicly available information. It is not intended to be professional advice.
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