What Is Not Allowed in an Airplane Carry-On? TSA Restricted Items Explained

Carry-on restrictions fall into three main groups: items allowed in the cabin under certain conditions, items that may travel only in checked baggage, and items prohibited in both. Each group has different requirements, from quantity limits to packaging and declaration rules.

To help you work out which rules apply to your belongings, this guide explains what is not allowed in an airplane carry-on under TSA and FAA requirements. It then shows you how to organize permitted items so they’re easier to take out for screening.

What Can You Bring in a Carry-On With Restrictions?

You can bring many everyday items in your carry-on, but some have limits on size or quantity. Others need to be packed a certain way or taken out for separate screening.

Liquids

When packing shampoo, toothpaste, or lotion in your carry-on luggage, check the container size. TSA’s 3-1-1 rule allows containers of 3.4 ounces (100 mL) or less, all fitting inside one clear, quart-size bag per passenger. A half-empty 6-ounce bottle still exceeds the limit because the container’s capacity matters.

Powders

Protein powder and powdered makeup are generally allowed. Quantities above 12 ounces/350 mL may need separate screening, including opening the container. If officers cannot clear the contents, the powder cannot enter the cabin. Consider checking larger quantities you won’t need during the journey.

Food and Beverages

Sandwiches and crackers generally pass screening, but yogurt, peanut butter, and sauces follow the liquids rule. Bring an empty water bottle and refill it after security. For international travel, check your destination’s food-entry restrictions as well.

Medical Items

Medications and medical supplies are allowed in carry-on baggage but must undergo screening. Medically necessary liquids may exceed 3.4 ounces (100 mL) in reasonable quantities for your trip and do not need to fit inside the quart-size bag. Tell the TSA officer about these liquids before screening and present them separately for inspection.

Sharp Objects

Nail clippers and disposable razors can generally stay in your carry-on. Scissor blades must be shorter than 4 inches from the pivot to the tip. Most knives and loose razor blades must be checked, with sharp edges safely covered.

Hand Tools

Measure ordinary screwdrivers, wrenches, and pliers from end to end when assembled. Those measuring 7 inches or less may qualify for carry-on baggage. Longer tools must be checked. Drills and saws do not qualify simply because they are small.

Battery-Powered Devices

Phones, cameras, and laptops with lithium-ion batteries up to 100 Wh are generally allowed in carry-on baggage. Larger batteries up to 160 Wh need airline approval, with a limit of two spares in that range. If you also pack spare lithium batteries or power banks, keep them in your carry-on and protect them against short circuits. 

Ignition Items

You can generally bring one ordinary disposable or Zippo-type lighter and one book of safety matches in your carry-on. If you want to check the lighter instead, up to two containing fuel are allowed in DOT-approved cases. Matches must stay in your carry-on.

Which Carry-On-Prohibited Items May Be Accepted in Checked Baggage?

Some items rejected at the checkpoint can travel with checked luggage. Packing requirements, airline policies, and applicable laws still determine whether they are accepted. 

Firearms

If you’re traveling with a firearm, pack it unloaded in a locked, hard-sided case for checked baggage. Take it to the airline’s check-in counter and declare it before handing over your luggage.

Ammunition

Small-arms ammunition may also travel in checked baggage when secured in packaging designed to hold cartridges. Confirm your airline’s quantity limits before packing, then declare the ammunition at the check-in counter.

Replica Weapons

Realistic replica guns may travel in checked baggage. Pack them securely to prevent damage and confirm that your airline and destination permit them.

Sharp Weapons

Where local laws allow, swords and similar blades can travel in checked baggage. Place each blade in a sheath or secure wrapping to protect anyone handling or inspecting your luggage.

Sporting Equipment

Baseball bats, golf clubs, and hockey sticks can travel as checked baggage. Your airline may require a protective case or charge an equipment fee, so check these details when arranging your flight. If your equipment requires a separate case, compare its dimensions against your airline’s limits and a current luggage sizes guide before departure. 

Power Tools

Drills and power saws must be checked and packed to prevent damage or accidental activation. If you bring spare lithium batteries, keep them in your carry-on. 

For these fuel-powered tools, you’ll need to confirm that your airline accepts them and remove all fuel, residue, and vapors before packing.

Self-Defense Items

If you’re flying within the U.S., check whether your airline accepts self-defense spray in checked baggage. If it does, you may pack one qualifying container of up to 4 fluid ounces (118 mL). It must have a safety mechanism to prevent accidental discharge. Any CS or CN tear gas content must not exceed 2% by mass.

This allowance does not extend to international flights, where ICAO/IATA rules prohibit self-defense sprays in both carry-on and checked baggage.

Which Items Cannot Be Brought Onto a Passenger Aircraft at All?

Not everything that’s banned from a carry-on can go in a checked bag instead. The items below are prohibited in both because they can cause fires, explosions, or other harm onboard. 

Explosives

Fireworks, sparklers, gunpowder, and blasting caps are prohibited in both carry-on and checked baggage.

Incendiary Devices

Devices designed to start destructive fires cannot travel in passenger baggage. Moving them to checked luggage does not make them acceptable.

Flammable Liquids

Gasoline, lighter fluid, and paint thinner are prohibited because their vapors can ignite. Specific toiletry exceptions mean alcohol-containing cosmetics are not automatically banned.

Compressed Gases

Propane cylinders and butane refills are prohibited. Certain safety devices have limited gas-cartridge exceptions, but those allowances do not cover ordinary fuel cylinders.

Hazardous Materials

Corrosive drain cleaners, poisons, and strong oxidizers are prohibited because they can cause chemical burns, poisoning, or dangerous reactions, even when packed in sealed containers. 

Prohibited Ignition Items

Strike-anywhere matches and lighter refills cannot travel in either bag. They do not share the cabin allowance for safety matches and ordinary lighters.

Prohibited Lithium Batteries

Lithium batteries that are damaged or recalled because they could overheat or catch fire cannot travel in carry-on or checked baggage unless made safe under applicable requirements. For ordinary consumer electronics, lithium-ion batteries above 160 Wh are also prohibited. 

How to Pack a Carry-On for Smoother TSA Screening

After checking what can travel, the next step is learning how to pack a suitcase efficiently and comfortably while keeping items that may need inspection accessible. This reduces the amount of unpacking required at the checkpoint. 

Keep the 3-1-1 Liquids Bag Near the Opening

Place the quart-size bag above clothing or beside the suitcase opening. Avoid burying it beneath packing cubes. Remove it when instructed; some screening lanes allow liquids to remain packed.

Separate Medication and Other Liquid Exemptions

Keep medication, breast milk, and other exempt liquids separate from your regular toiletries so you can present them for inspection without searching through your bag. 

For your regular toiletries, the Pebble 20" Carry-on’s wet/dry zippered compartment gives you a place to store your quart-size liquids bag apart from your clothes. Its interior compression panel helps hold clothing in place as you take the bag out and put it back.

Pack Laptops and Large Electronics for Quick Removal

If you plan to use your laptop during the trip, keep it where you can reach it without unpacking your clothes. The Getaway 20" Carry-on: Front-Opening has a front laptop compartment for this. If you prefer the aluminum frame and dual locks of the Pebble Collection, pack your laptop and other large electronics near the top of the main compartment. That way, you can take them out easily if a TSA officer asks to screen them separately. 

If you prefer a hard-shell suitcase with latch closures, the Pebble Collection combines an aluminum frame with dual locks, so there’s no zipper to undo around the case. The Pebble 20" Carry-on also has an interior compression panel that helps keep clothes in place while you retrieve electronics packed above it.

Remove Power Banks, Spare Batteries, and Vapes Before Gate-Checking

When packing, protect exposed battery terminals and secure vapes against accidental activation. If your carry-on needs to be checked at the gate, remove power banks, spare lithium batteries, and vapes before handing it over, and keep those items with you in the cabin.

Conclusion

Finding a restricted item in your bag at security can mean leaving it behind or returning to the airline counter. So checking the rules while you pack can help you avoid these problems. Once you know what can travel, keep anything that may need inspection easy to reach so you won’t have to unpack the rest of your bag. 

FAQ

What 7 things should you not wear on a plane?

No rule bans seven specific clothing items. For comfort, consider avoiding tight jeans, high heels, heavy boots, a stiff belt, bulky jewelry, strong perfume, and thin clothing without an extra layer. The goal is to stay comfortable while sitting for hours and moving through the airport.

What is forbidden in a carry-on bag?

Under U.S. screening rules, firearms, knives, box cutters, fireworks, and fuel cannot go in a carry-on. Some are also prohibited in checked bags, so moving an item to your suitcase is not always an option.

What is not permitted in carry-on baggage?

Liquids in containers larger than 3.4 ounces (100 mL) generally cannot pass through U.S. security in a carry-on. Medically necessary liquids have an exception and may require separate screening. Bats and clubs must also stay out of the cabin.

What items are now banned from checked bags?

“Now banned” suggests a recent rule change, but the key restriction is an established one: power banks, spare lithium batteries, and vaping devices cannot go in checked bags. Keep them with you in the cabin, including when your carry-on is checked at the gate.

What is not allowed on a carry-on bag on an airplane?

Attaching an item to the outside of your bag does not exempt it from security rules. A pocketknife clipped to the bag is still prohibited in the cabin, and liquids in an outside pocket must meet the same limits as liquids packed inside.