Federal rules ban a long list of prohibited items from checked bags, and the list is broader than most travelers realize: flammable fuels, spare lithium batteries, vaping devices, fireworks, gunpowder, compressed gas cylinders, high-proof alcohol, and marijuana all belong in the cargo hold’s “no” column. The FAA and TSA enforce these limits under 49 CFR Part 175, and getting caught can mean anything from a confiscated item to a five-figure fine or a federal criminal charge. Below is what you cannot check, what you can check under conditions, and what happens when the rules are broken.
Flammable Liquids and Fuels
Gasoline, kerosene, lighter fluid, and camp stove fuel cannot go in checked bags in any quantity. The FAA is explicit about camp fuel: all forms are forbidden, including containers and equipment that still hold residual fuel or vapors.1Federal Aviation Administration. PackSafe – Fuels A backpacking stove has to be completely purged before it goes in a suitcase, and even then some airlines will refuse it.
Strike-anywhere matches and lighter refills that contain unabsorbed liquid fuel are also banned from checked luggage.2eCFR. 49 CFR 175.10 – Exceptions for Passengers, Crewmembers, and Air Operators Standard disposable lighters using absorbed fuel or butane are allowed on your person or in a carry-on, but never in a checked bag.
Explosives, Fireworks, and Gunpowder
Fireworks, flares, blasting caps, sparklers, poppers, and bottle rockets are all banned from checked bags regardless of size.3Federal Aviation Administration. PackSafe for Passengers Novelty items that seem harmless are still classified as explosives for air transport.
Gunpowder and black powder are prohibited in both carry-on and checked bags, including percussion caps.4Transportation Security Administration. Gun Powder Standard small arms ammunition is a separate matter and is allowed under the firearms rules below, but loose powder is never permitted. Hand grenades and realistic replicas of explosive devices are also banned, even if non-functional. A replica grenade in a checked bag will trigger a law enforcement response.
Lithium Batteries, Power Banks, and Vaping Devices
This is the category that trips up the most travelers. Spare lithium-ion and lithium-metal batteries, portable chargers, and power banks are flatly prohibited from checked luggage. They must travel in carry-on bags only.5Federal Aviation Administration. PackSafe – Lithium Batteries If your carry-on gets gate-checked at boarding, pull out every spare battery and power bank and bring them into the cabin.6Transportation Security Administration. What Can I Bring?
The reason is thermal runaway. A shorted lithium cell can heat rapidly enough to ignite nearby materials, and cargo hold fire suppression is not designed to handle lithium fires. In the cabin, crew can see the problem and use the onboard fire containment bags most airlines now carry.
Batteries installed inside devices like laptops, cameras, and phones may be checked, but only up to 100 watt-hours for lithium-ion and 2 grams of lithium for lithium-metal cells.6Transportation Security Administration. What Can I Bring? Most consumer electronics fall well within those limits.
Electronic cigarettes, vape pens, and every other battery-powered nicotine delivery system are prohibited from checked bags. They have to be carried on your person or in your carry-on.7Federal Aviation Administration. PackSafe – Electronic Cigarettes, Vaping Devices Spare batteries for vaping devices follow the same rule and need to be protected against short circuits, either in their original packaging or with the terminals taped.
Compressed Gases and Oxygen
Compressed gas cylinders cannot go in checked bags unless the cylinder is completely empty, the regulator valve has been disconnected, and the open end is visible so a TSA officer can verify the interior.8Transportation Security Administration. Small Compressed Gas Cartridges A sealed cylinder with an attached valve is banned regardless of what the gauge reads. Full or partially full CO2 cartridges for paintball guns and bike tire inflators cannot be checked.
Personal compressed oxygen and liquid oxygen are banned from both carry-on and checked bags. So are products marketed as “canned oxygen,” “recreational oxygen,” or “flavored oxygen.”9Federal Aviation Administration. PackSafe – Oxygen (Compressed or Liquid) If you need supplemental oxygen in flight, certain FAA-approved portable oxygen concentrators are allowed in the cabin, but confirm your specific model with the airline first.10Transportation Security Administration. Portable Oxygen Concentrators
Household Chemicals and Self-Defense Sprays
Corrosive and toxic household chemicals like bleach, drain cleaner, and pool chlorine cannot be checked. The same applies to industrial solvents, paint thinner, and turpentine. These substances leak under pressure changes, corrode containers, and can produce toxic fumes.
Pepper spray is treated more generously than travelers often expect. One container of mace or pepper spray up to 4 fluid ounces (118 mL) is allowed in checked baggage, provided it has a safety mechanism to prevent accidental discharge.11Transportation Security Administration. Pepper Spray Sprays containing more than 2 percent tear gas (CS or CN) by mass are banned outright, and any container over 4 ounces is prohibited regardless of its contents.2eCFR. 49 CFR 175.10 – Exceptions for Passengers, Crewmembers, and Air Operators Check the label; most consumer pepper sprays comply, but some law enforcement-grade products exceed the tear gas threshold.
Firearms and Ammunition
Firearms are allowed in checked bags under strict conditions. The gun has to be unloaded, packed in a locked hard-sided container, and declared to the airline at check-in.12Transportation Security Administration. Firearms Only the passenger should hold the key or combination. Firearms cannot go in a carry-on or on your person.
Standard small arms ammunition up to .75 caliber and shotgun shells of any gauge can travel in checked bags when packed in a container designed for ammunition, such as the original cardboard box, a plastic ammo case, or a metal box.13Transportation Security Administration. Transporting Firearms and Ammunition Ammunition may share the locked case with the firearm if properly boxed. Loaded magazines and clips have to be enclosed in a container or placed inside the locked case. Explosive or incendiary ammunition is never permitted.
Alcohol Over 140 Proof
Most alcohol can go in checked bags. The rules split by proof:14eCFR. 49 CFR 175.10 – Exceptions for Passengers, Crewmembers, and Air Operators
- Beer, wine, and other beverages at 24% ABV or less: no quantity limit.
- Spirits between 24% and 70% ABV: allowed in unopened retail packaging, up to 5 liters total per passenger.
- Anything over 70% ABV (above 140 proof): banned from both checked and carry-on bags. This covers grain alcohol, 151-proof rum, and similar high-proof spirits.
The 70% cutoff exists because beverages above that concentration are classified as flammable liquids.15Transportation Security Administration. Alcoholic Beverages
Marijuana
Marijuana remains illegal under federal law, and air travel is federally regulated, so checking cannabis is a federal offense even when flying between two states where it is legal. TSA officers do not actively search for it, but if they find it during routine screening they are required to refer the matter to law enforcement.
Hemp-derived CBD products with no more than 0.3 percent THC by dry weight are generally permitted in both carry-on and checked bags.16U.S. Food and Drug Administration. Hemp Production and the 2018 Farm Bill TSA cannot test THC concentration on the spot, so clear product labeling helps avoid delays.
Items Allowed Under Conditions
A few items you might assume are banned can actually be checked with the right precautions. Dry ice is permitted up to 2.5 kilograms (5.5 pounds) per person for keeping perishables cold, but you need airline approval, the packaging cannot be airtight (dry ice sublimates into CO2 and will burst a sealed container), and the package has to be labeled “Dry ice” or “Carbon dioxide, solid” with the net weight.17Federal Aviation Administration. PackSafe – Dry Ice
Gas-powered equipment like chainsaws, generators, and string trimmers may be checked only if completely purged of fuel and vapors, and individual airlines can still refuse them.18Federal Aviation Administration. PackSafe – Engine Powered Equipment Any trace residue disqualifies the item.
Penalties for Prohibited Items in Checked Bags
Consequences range from confiscation to federal prosecution.
TSA civil penalties for prohibited items found in checked bags start at $450 for items like flammable liquids and fireworks, and climb to $17,062 or more for high explosives, which also trigger a criminal referral.19Transportation Security Administration. Civil Enforcement Undeclared loaded firearms in checked bags carry penalties between $1,700 and $3,410 plus a criminal referral. A first-time violation for an undeclared unloaded firearm may result in only a warning notice.
Separate from TSA fines, the Department of Transportation can impose hazardous materials civil penalties up to $102,348 per violation, rising to $238,809 if the violation causes death, serious injury, or substantial property destruction.20eCFR. 49 CFR 107.329 – Maximum Penalties
Criminal prosecution is reserved for the most serious violations. Knowingly or recklessly violating federal hazmat transportation law carries up to five years in prison, rising to ten years if the violation involves a release of hazardous material that causes death or bodily injury.21Office of the Law Revision Counsel. 49 USC 5124 – Criminal Penalty Confiscated items are not returned. TSA has no process for retrieving prohibited items removed during screening.22Transportation Security Administration. How Do I Retrieve a Prohibited Item That Was Removed From My Baggage