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23 Things That Could Get Your Checked Luggage Flagged by the TSA

No one wants a TSA agent rifling through their bags because they've packed something problematic. Here's what you can—and can't—take on a plane in checked luggage.

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Checked luggage rules you need to know

Whether you’re traveling for work or jetting off to a dreamy locale, you might stress about making packing mistakes. Beyond not forgetting the essentials, it’s smart to pay special attention the TSA carry-on rules—especially the TSA liquid limit and food rules—so you can get through the airport security check quickly. You’re probably also wondering, What can I take on a plane in checked luggage? After all, you don’t want TSA agents rifling through your bags if you can help it … or, worse, having some of your things end up in the bin of TSA confiscated items.

Well, we have good news for you. “People think that TSA just randomly opens up bags here and there—that is not the case,” says Lorie Dankers, a TSA spokesperson for the Western U.S. region. “We rely on technology to look for certain things.”

Which things, exactly? We spoke to both the TSA and Federal Aviation Administration (FAA) to find out what you should avoid packing to make sure you stay on the right side of their checked luggage rules.

Open travel bag with summer clothes, hat, film camera and passports on white background, top view, flat layRoxiller/Getty Images

What is allowed on a plane in a checked bag?

In general, TSA rules for checked luggage are much more lenient than for carry-ons, so you can pack everything from drinks and other liquids well over 3.4 ounces to certain types of weapons. That’s because at the security checkpoint, whether it’s the carry-on X-ray machine or the body scanner, agents are looking for anything that could be used to threaten the safety of passengers or crew members. With checked baggage, TSA agents are looking for something a lot more specific.

“Our screening procedures [in checked bags] focus on detection of explosives, explosive components and explosive residue,” says Dankers. “We don’t want anything to get into the belly of the aircraft that could explode and be catastrophic.”

Agents can figure out what most things are using the TSA’s high-tech checked baggage inspection system (CBIS), which is equipped with an explosive detection system (EDS) that creates 3D X-ray images of your bag’s contents. Anything that’s potentially flammable or explosive will be removed. Items that agents are unsure about will be flagged for up-close inspection. In both scenarios, your bag will end up with a little “Notice of Inspection” tag on it. But, adds Dankers, “EDS does clear the vast majority of bags. Less than 5% need to be opened for physical inspection.”

Dankers adds that other agencies, such as the FAA and Customs and Border Protection (CBP), may have additional restrictions, especially with regard to fresh food items from other countries. With that in mind, here are the top items that will get your checked luggage flagged.

alcohol being poured into a glass on a grey backgroundJose A. Bernat Bacete/getty images

High-proof alcohol

It’s OK to pack most alcohol, whether it’s wine or hard liquor, in checked luggage as long as it is in its unopened retail packaging. But anything over 140 proof (70% alcohol) is prohibited because it’s more flammable. “Flammable liquids pose a risk to aircraft,” explains Donnell Evans, a spokesman for the FAA, “and the risk increases with volume.” That’s also why you can’t pack an entire case of that amazing Napa or Sonoma wine. The FAA restricts each passenger to five liters (1.3 gallons) of alcohol. FYI, if you buy alcohol in a duty-free shop at the airport, you can bring it in your carry-on as long as it’s packed in a sealed STEB bag.

matches coming out of a lighter on gray backgroundDigitalVision/Getty Images

Lighters and matches

The only lighters permitted in checked luggage are those without fuel or contained in a Department of Transportation–approved case, also called a DOT case. In carry-ons, however, you’re permitted to bring one lighter or one packet of safety matches. (Matches are not permitted in checked bags at all, though, and strike-anywhere matches are forbidden anywhere on a plane.)

“Lighters and matches pose a greater threat in checked baggage because an unintentionally started fire can be more easily extinguished inside the aircraft cabin [than in the luggage hold],” Evans explains. So whether you need them to start a campfire for s’mores or to indulge that habit you’re still trying to quit, it’s best to bring these items in your carry-on bag. Here are more things you should always pack in your carry-on.

blue camp stove propane canister with a faint glowing flamethe_burtons/getty images

Camp-stove propane canisters

Speaking of camping, you can’t bring this common but highly flammable fuel in your luggage either. However, if you acquire some propane canisters on your trip and use them up, you can safely pack the empties in your luggage to recycle or refill later. “Empty canisters that have been properly cleaned, purged and no longer contain any residual fuels or vapors are not considered dangerous goods,” Evans explains.

a variety of colored e-cigarettes on a gray backgroundYaroslav Litun/getty images

E-cigarettes and vapes

These cigarette substitutes are not allowed in checked luggage under any circumstances because they contain lithium batteries, which are flammable. “There have been several incidents of fire, smoke or extreme heat due to e-cigarettes and vapes,” Evans says. He further explains that should a lithium battery spark a fire, it is more easily extinguished in the cabin of the aircraft. So stash your vapes in your carry-on bag, but check with your airline to see if it restricts the number of devices you may bring.

purple spray can on a grey backgroundJavier Zayas Photography/getty images

Aerosols and compressed gases

This includes things like bear spray for your backpacking trip, fire extinguishers, spray paint, cooking spray and even spray starch. “If that bear spray were to go off in checked luggage, it would get into the system of the aircraft,” and it would affect baggage handlers, crew and passengers, Dankers explains. However, you are allowed to bring personal-care products, such as deodorant and hairspray, in aerosol containers, in your checked luggage.

different sized bullets on a grey backgroundAndrea Donetti/getty images

Ammunition

Go ahead and pack your (legal) guns in your checked bag—the TSA permits them as long as they’re packed in a locked hard-sided container and declared to the airline at check-in. When it comes to ammunition, however, the rules are a bit stricter, and if you don’t follow them closely, your luggage could get flagged.

The TSA and FAA both permit ammunition up to .75 caliber and shotgun shells of any gauge, but it must be packed in a box specifically designed for this purpose, and you must declare it to your airline. International regulations, along with some U.S. airlines, limit the amount of ammo you can travel with to 11 pounds per passenger. Other types of ammunition—including black powder, smokeless powder, primers, percussion caps or homemade powder and ball loads for muzzle loading—are all prohibited by the FAA.

spray bleach bottleJakeOlimb/getty images

Ammonia and bleach

Sorry, clean freaks—you can’t pack ammonia or bleach to sanitize that Airbnb. Buy it when you land so TSA doesn’t flag your luggage. While neither one is flammable on its own, ammonia can be explosive when mixed with other chemicals, and bleach is considered an oxidizer, which can make a fire start more easily and spread more quickly. As a result, both are prohibited as hazardous materials.

firecrackers on a grey backgroundDon Farrall/getty images

Fireworks

Leave the fireworks at home—they are, quite literally, explosive. Dankers says TSA sees an increase in attempts to transport these every year around the 4th of July, and, of course, you can see why this could be a problem on an airplane.

three Lithium Batteries on a grey backgroundBrasil2/getty images

Lithium batteries

Speaking of explosives, these types of batteries—which are used in everything from e-cigarettes to laptop computers—have been known to explode mid-flight, so they’re now prohibited unless they’re contained in a device that offers protection. That means you can pack an electronic toothbrush or a camera that contains a lithium battery, but if it’s just a pure battery—like a power bank used to charge cell phones, or a spare laptop battery—it needs to go in your carry-on bag.

FYI, this type of battery is often used in smart luggage with built-in charging ports. If your suitcase has this feature, you’ll need to remove the charger before you check your bag.

close up of super glue coming out of a tubealex_kz/getty images

Specialty glue

While white school glue is fine, other specialty glues and pastes, such as model glue, rubber cement and some superglues, are highly flammable and therefore prohibited in checked bags. “Different adhesives include a wide range of chemicals—some are flammable,” Evans says. To see if the one you want to pack is flammable, Evans advises checking the product label or the manufacturer’s safety data sheet. To really be on the safe side and avoid having your bag flagged for inspection, just don’t pack glue.

scuba tank on a grey backgroundCaspar Benson/getty images

Pressurized air tanks

If you’re going on a big scuba vacation, it’s probably best to rent supplies at your destination. If you try to pack a pressurized air tank, your luggage won’t make it through TSA. “All cylinders (including scuba tanks) containing air or other nonflammable, nontoxic gases are regulated as hazardous materials once they reach a pressure of 200kPA at 68 degrees,” Evans says. Empty scuba tanks are OK, but be prepared to open the valves for your airline.

Similarly, compressed or liquid forms of oxygen—including those trendy flavored O2 canisters marketed for use at high altitudes—are highly flammable and not allowed in checked or carry-on bags. If you need oxygen for a medical condition, you’ll need to pack a portable oxygen concentrator. Rather than compressing oxygen, this type of system separates ambient oxygen from nitrogen and other gasses in the air and delivers the oxygen to a user in a continuous flow.

cordless curling iron with blond hair on a grey backgroundEvgeniya Sheydt/getty images

Cordless curling irons

These contain a butane-powered cartridge, which is at risk of exploding mid-flight. Bring your old-fashioned corded curling iron instead—or learn how to curl your hair without a curling iron.

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Chemical kits

These include kits for testing water or soil, as well as kids chemistry kits. Any chemicals that could explode—such as corrosives, oxidizers and organic peroxides—are banned from checked luggage as well as carry-on bags. So if you want to help your aunt test her soil before planting a garden, or you want to test the water quality at your vacation getaway, have these tests sent directly to your destination.

wrapped presents on a grey backgroundPeter Dazeley/getty images

Wrapped presents

Because TSA’s threat detection system relies on being able to “see” what each item is, wrapped presents can trigger the need for additional inspection. “If the gift needs further inspection, the TSA inspector will unwrap it,” Dankers says. “Rather than [risking this], don’t wrap it at all, or put it in a gift bag for quick inspection.” This is one of the holiday travel tips that will make your life so much easier.

pink toy grenade on a grey backgroundmailfor/getty images

Certain novelty items

Dankers says she’s seen an item sold in at least one airport gift shop that looks like an inert grenade, but with little legs and antennae attached, so it resembles a bug. That kind of souvenir will definitely get your bag flagged for inspection. However, once TSA determines that the object poses no threat, the item will be placed back in your bag—along with that little notice of inspection. Here are a few other things you may not want to buy at an airport.

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Car axles

Yep, the TSA has seen it all. Occasionally, people will pack a car axle in their bags. “It’s OK to travel with,” Dankers says, but “it looks really odd on the X-ray screen.” So TSA agents will most likely open up your suitcase if they see this—or anything else they can’t visually identify—and swab for explosive residues. Once it’s determined that the item poses no threat, it will go back in your bag and be on its way to your destination.

pineapple on a grey backgroundDoina Gherban/getty images

Meat and produce

If you’re traveling domestically, you can generally pack any food you want in your checked bag—as long as TSA can easily determine what it is. But if you’re returning from a trip abroad, think twice before bringing home that amazing Eastern European salami or those juicy tropical mangoes. CBP prohibits the importation of most meat, fruits and vegetables to prevent the introduction of pests and diseases to the United States. Before heading home, it’s a good idea to check with CBP to make sure your souvenir won’t be problematic.

If you’re wondering about coffee, TSA and CBP agents won’t bat an eye if it’s in your checked bag. Sure, we’ve all heard the stories about people trying to disguise the scent of cannabis or other federally illegal drugs with coffee, so TSA agents at airport security may give a carry-on bag with coffee a little extra attention, but when it’s packed in a suitcase, there’s no concern. So bring home those single-origin coffee beans, whether ground or whole, and enjoy the flavor of vacation in every sip.

medication bottle with spilled pills on a grey backgroundPeter Dazeley/getty images

Medications

It’s perfectly legal to place your medications in your checked bag, though it might be better to keep them in your carry-on bag in case of flight delays or cancellations. And while the TSA doesn’t have any specific rules about keeping your meds in their original bottles, some states and countries do. It’s also a good idea to only bring as much medication as you’ll need on your trip to avoid arousing suspicion (though it’s legal to bring any amount). Dankers says that when someone is bringing medications for personal use, it generally looks quite different than when someone is trafficking drugs.

Close-Up Of Bottles Against White BackgroundMaria Kovalets/Getty Images

Can I bring full-size shampoo in checked luggage?

As noted earlier, there’s no rule for liquids (except for alcohol) in your checked bags. That said, just because you can pack your full-size liquid toiletries in your suitcase, it doesn’t mean you should. Baggage is not handled daintily, and no one wants to spend the first day of their trip washing the exploded bottle of body lotion out of their clothing. Besides, if those bottles are heavy, they may cause you to exceed the weight limit for checked bags. If you do pack them, make sure they’re in a sealed Ziploc bag or other securely closed toiletry bag.

Is the TSA looking for drugs in checked luggage?

“TSA, in the course of screening, is not looking for drugs. We’re focused on security threats,” reiterates Dankers. “[But] if we come across anything that is illegal on the federal level, we have no choice but to notify airport law enforcement, and then it’s up to their discretion what they want to do with that situation.”

How heavy can a checked bag be?

The TSA does not set weight limits for checked bags, but airlines do. The maximum allowable weights vary by airline, and sometimes by status or type of seat purchased. Generally, they range from 40 to 70 pounds for both domestic and international flights. You can avoid overweight fees (or doing the last-minute shuffle of items from your luggage to your carry-on at the check-in counter) by using smart luggage that automatically calculates the weight of your haul as you pack.

What else can I take on a plane in checked luggage?

For more do’s and don’ts for your checked luggage, download the MyTSA app and visit the FAA’s PackSafe for Passengers site. You can also ask TSA directly on Facebook Messenger or Twitter at @AskTSA.

For a different kind of luggage mishap on your flight, find out how to get a lost luggage reimbursement, just in case your bags don’t make it to their destination.

Sources:

  • Lorie Dankers, a TSA spokesperson for the Western U.S. region
  • TSA: “What Can I Bring?”
  • FAA: “PackSafe for Passengers”
  • Donnell Evans, public affairs specialist, office of communications, at the FAA
  • CBP: “Prohibited and Restricted Items”
  • TSA: “Can you pack your meds in a pill case and more questions answered”

Laurie Budgar
Laurie is a lifestyle writer for RD.com covering current events, finance, technology, and pets. She has spent decades traveling (often solo) around the world, using the latest personal technology, and loving on her pets – and writes about these topics often.