The TSA's core banned items list

The Transportation Security Administration (TSA) maintains a list of items you cannot bring through airport security in your carry-on bag. Some items are banned entirely from both carry-on and checked luggage. Others are allowed in checked bags but not at the checkpoint or in the cabin.

The most common reason an item gets stopped is that it could be used as a weapon or poses a fire risk at altitude. Lighters, sharp objects, tools, and certain sports equipment fall into this category. Liquids and gels over 3.4 ounces (100 millilitres) are also prohibited in carry-on, though you can pack larger quantities in checked luggage.

TSA officers screen every carry-on bag at the checkpoint. If an item is questionable, they will confiscate it. You do not get it back, and you cannot go back through security to retrieve it once you have passed the checkpoint.

Key Takeaways

  • Lighters, matches, and flammable items are banned from both carry-on and checked bags, with rare exceptions for one lighter in checked luggage on some airlines.
  • Sharp objects including knives, box cutters, razors, and scissors with blades longer than 4 inches cannot go in carry-on bags.
  • Liquids, gels, and aerosols larger than 3.4 ounces per container are prohibited in carry-on but allowed in checked bags.
  • Tools, sporting equipment, and self-defense items like pepper spray and stun guns are restricted or banned depending on the specific item and your destination.
  • Some items banned by TSA may also be illegal under state or local law, so check your destination before packing.

Weapons and sharp objects you cannot pack

Knives of any size are prohibited in carry-on luggage. This includes pocket knives, utility knives, box cutters, and kitchen knives. Scissors are allowed only if the blades are shorter than 4 inches and the handles are rounded. Razors and razor blades cannot go in carry-on either, though you can pack them in checked luggage.

Firearms, ammunition, and realistic replica guns are banned from carry-on. Firearms can be transported in checked bags only, and they must be unloaded, declared to the airline at check-in, and packed in a locked hard-sided container. Ammunition must also be in checked luggage in a manufacturer's container or an equivalent hard-sided case.

Self-defense items like pepper spray, mace, and stun guns are prohibited in carry-on bags. Pepper spray is allowed in checked luggage only if it has a safety mechanism to prevent accidental discharge, and you must declare it to the airline. Stun guns and similar devices cannot be packed in either carry-on or checked bags on commercial flights.

Lighters and flammable materials

All lighters are banned from carry-on luggage. This includes standard disposable lighters, refillable lighters, and electronic lighters. Matches are also prohibited in carry-on bags. Most airlines ban lighters from checked luggage as well, though some allow one lighter in a checked bag if it is placed in a protective case.

Other flammable items banned from carry-on include lighter fluid, fuel, paint thinner, and aerosol cans with flammable contents. Fireworks, flares, and sparklers cannot be packed in either carry-on or checked luggage. If you need to transport any of these items, you will need to ship them separately or leave them behind.

Liquids, gels, and aerosols over 3.4 ounces

The 3-1-1 rule limits liquids in carry-on bags: each container can hold no more than 3.4 ounces (100 millilitres), all containers must fit in one quart-sized clear plastic bag, and you can bring only one bag per person. This rule applies to anything that flows, spreads, or sprays, including shampoo, conditioner, lotion, toothpaste, peanut butter, yogurt, and jam.

Aerosol cans like deodorant, hairspray, and sunscreen are limited to 3.4 ounces in carry-on. Gels such as hair gel, aloe vera gel, and contact lens solution follow the same rule. You can pack larger quantities of these items in checked luggage, but some airlines have additional restrictions on the total quantity of aerosols per bag.

Perfume and cologne are allowed in carry-on as long as each bottle is 3.4 ounces or smaller. Medications in liquid or gel form are exempt from the 3.4-ounce limit if they are declared, but you should carry a prescription or doctor's note to avoid delays at security.

Tools and sporting equipment

Most tools are prohibited in carry-on bags. This includes hammers, screwdrivers, wrenches, saws, drills, and power tools. Hand tools like pliers and adjustable wrenches are also banned. You can pack these items in checked luggage without restriction.

Sporting equipment rules vary by item. Baseball bats, cricket bats, and similar clubs cannot go in carry-on but are allowed in checked bags. Golf clubs are permitted in checked luggage only. Ski poles, ice axes, and mountaineering equipment are prohibited in carry-on. Fishing rods, archery equipment, and spear guns have specific restrictions depending on the airline and destination.

Sports equipment that is allowed in carry-on includes tennis rackets, badminton rackets, and squash rackets, provided they fit in the overhead bin or under the seat. Skis and snowboards must go in checked luggage. Always contact your airline before packing sporting gear, because rules vary between carriers.

Explosives and hazardous materials

Explosives and materials that could detonate are completely banned from both carry-on and checked luggage. This includes fireworks, dynamite, gunpowder, and blasting caps. Flares, signal devices, and emergency beacons are also prohibited. Certain types of batteries, particularly lithium batteries in excess of the airline's limits, are restricted because they pose a fire risk.

Hazardous materials like pesticides, insecticides, and certain cleaning products cannot be transported on passenger aircraft. Corrosive substances such as drain cleaner, battery acid, and pool chemicals are banned. Compressed gas cylinders, including propane, butane, and oxygen, are prohibited in both carry-on and checked bags.

If you are unsure whether a substance is hazardous, check the product label or contact the airline before you arrive at the airport. Some items that seem harmless—like certain types of nail polish or paint—may be classified as hazardous and require special handling or cannot be transported at all.

Items that vary by airline and destination

Some items fall into a gray area where TSA rules allow them but individual airlines or destination countries may not. Certain types of batteries, for example, are restricted by some airlines even though TSA permits them. Electronic devices with lithium batteries larger than 100 watt-hours may be prohibited or require airline approval.

Destination laws also matter. Some countries ban items that are legal in the United States. Pepper spray, for instance, is illegal in many European countries and Australia. Certain medications that are over-the-counter in the US are controlled substances elsewhere. Before packing anything that might be questionable, research the laws of your destination country.

International flights have stricter rules than domestic flights. Items allowed on a flight from New York to California may be prohibited on a flight from New York to London. When in doubt, contact your airline directly rather than assuming TSA clearance means you can bring the item through your entire journey.

What to do if you are unsure about an item

The TSA website includes a searchable database called "What Can I Bring?" where you can type in any item and see whether it is allowed in carry-on, checked luggage, or both. This tool covers thousands of items and is updated regularly. If the item you are looking for is not listed, you can submit a question directly to TSA on social media or through their website.

Your airline's website also has a baggage policy page that lists prohibited items specific to that carrier. Some airlines are stricter than TSA, so checking both sources is worth your time. If you have a valuable or unusual item you want to bring, calling the airline's baggage department before you pack is the safest approach.

If you arrive at the airport with a prohibited item, TSA will confiscate it. You cannot retrieve it later. If you realize before security that you have something banned, you can leave it with a friend, mail it to your destination, or throw it away. Once you pass the checkpoint, the item is gone.

Frequently Asked Questions

Can I bring a lighter if I do not use it during the flight?

No. All lighters are banned from carry-on regardless of whether you plan to use them. Some airlines allow one lighter in a checked bag if it is in a protective case, but policies vary. Contact your airline before packing to confirm their specific rules.

Are prescription medications subject to the 3.4-ounce liquid rule?

Liquid and gel medications are exempt from the 3.4-ounce limit in carry-on bags. However, you should carry the original prescription bottle or a doctor's note to explain what the medication is. TSA may open and inspect the container at security.

Can I pack a knife in my checked bag?

Yes. Knives of any size are allowed in checked luggage. They must be sheathed or wrapped so the blade does not cut through the bag or injure baggage handlers. Knives are prohibited only in carry-on bags.

What happens if I accidentally bring a banned item to the checkpoint?

TSA will confiscate it. You cannot go back through security to retrieve it, and the item will not be returned to you. If you realize before reaching the checkpoint that you have a prohibited item, you can leave it with someone outside security, mail it, or discard it.

Do international flights have different rules than domestic flights?

Yes. International flights often have stricter rules than domestic flights, and destination countries may ban items that TSA allows. Always check both TSA rules and your destination country's regulations before packing, especially for items like pepper spray, certain medications, or electronics.