What goes in checked bags versus carry-on

Checked luggage has different rules than carry-on bags. The TSA allows many items in checked bags that are banned from the cabin — liquids larger than 3.4 ounces, sharp objects, and tools. The trade-off is that checked bags are out of your sight until you land, and airlines charge fees to check them. You need to know what is actually permitted before you pack, because discovering a banned item at the airport means either paying to ship it home or throwing it away.

The rules come from two sources: the TSA (Transportation Security Administration), which handles what can board any US flight, and individual airlines, which add their own restrictions on weight, size, and contents. A item the TSA permits may still be rejected by your airline. Always check your specific airline's baggage policy before packing.

Key Takeaways

  • Checked bags allow liquids, gels, and pastes in containers larger than 3.4 ounces, but they must be packed in a way that leaks won't damage other luggage or the aircraft.
  • Sharp objects like knives, razors, and scissors are allowed in checked bags but prohibited in carry-on, so pack them in your checked luggage only.
  • Batteries, electronics, and tools have specific rules — some are allowed, some are restricted to checked bags only, and some are banned entirely from all luggage.
  • Firearms, ammunition, and explosives require advance notice to your airline and must be packed in a locked, hard-sided container in checked luggage.
  • Weight and size limits vary by airline; exceeding them results in overweight fees, so measure and weigh your bag before arriving at the airport.

Liquids, gels, and creams in checked bags

Checked bags have no size limit on liquids, gels, creams, or pastes. You can pack full-size bottles of shampoo, conditioner, lotion, sunscreen, peanut butter, yogurt, and other wet or thick items. This is the main advantage of checking a bag if you travel with toiletries or food.

However, the container must be leak-proof or packed so that leaks won't damage the aircraft or other passengers' belongings. Place bottles in a sealed plastic bag, wrap them in plastic wrap, or use a toiletry bag with a waterproof lining. If a bottle leaks during flight and damages cargo or the plane's interior, you may be liable. Airlines also reserve the right to refuse bags that appear likely to leak.

Alcohol is allowed in checked bags in the US, but the container must be unopened and the total alcohol content cannot exceed 70% ABV (alcohol by volume). Quantities are limited — typically one liter per passenger — and some airlines charge a fee. Check your airline's policy on alcohol before packing.

Sharp objects and tools

Knives, razors, scissors, box cutters, and other sharp objects are prohibited in carry-on bags but allowed in checked luggage. This is one of the clearest differences between the two. Pack kitchen knives, chef's knives, pocket knives, and safety razors in your checked bag only, not in your personal item or roller bag that stays with you.

Tools like screwdrivers, wrenches, hammers, saws, and drills are also allowed in checked bags. Power tools are permitted as long as the battery is removed or disconnected. Nail guns and powder-actuated tools are prohibited in all luggage.

Scissors are allowed in checked bags if the blades are less than 7 inches long and the handles are rounded. Straight razors and open razors are prohibited; only safety razors and cartridge razors are permitted.

Batteries and electronics

Spare batteries have strict rules. Lithium batteries — the kind in phones, laptops, and power banks — are allowed in checked bags only in limited quantities. You may pack up to two spare lithium-ion batteries (like those for cameras or laptops) in checked luggage, but they must be in their original retail packaging or have tape over the terminals to prevent short circuits. Loose lithium batteries are prohibited in checked bags.

Alkaline batteries (AA, AAA, C, D, 9V) are allowed in both carry-on and checked bags with no quantity limit. Rechargeable batteries like NiMH and NiCd are also allowed in both.

Electronics like laptops, tablets, cameras, and gaming devices are allowed in checked bags, but packing them there means they could be damaged, stolen, or lost. Most travelers keep electronics in carry-on bags for safety. If you do check electronics, pack them in protective cases and consider removing the battery if possible.

Firearms and ammunition

Firearms are allowed in checked bags only, never in carry-on. You must notify the airline in advance — usually at least 24 hours before your flight. The firearm must be unloaded and packed in a locked, hard-sided container. You cannot use a TSA lock; the lock must be one that only you can open. The key or combination stays with you.

Ammunition is also allowed in checked bags only, in quantities up to 11 pounds per passenger. It must be in original manufacturer packaging or a find container designed for ammunition. Ammunition cannot be in the same locked container as the firearm; it must be in a separate locked container or packed separately in checked luggage.

Some airlines charge a fee to transport firearms, and some routes or destinations prohibit them entirely. International flights have different rules depending on the country. Contact your airline directly before packing any firearm.

Sporting equipment and outdoor gear

Most sporting equipment is allowed in checked bags: golf clubs, tennis rackets, skis, snowboards, fishing rods, and baseball bats. Bicycles are allowed but usually require a bike bag or hard case and may incur a fee. Scuba diving equipment, including tanks, is allowed in checked bags but not in carry-on.

Camping gear like tents, sleeping bags, and camp stoves (empty and clean) are permitted. Fuel canisters, propane, and lighter fluid are prohibited in all luggage. If you use a camp stove, make sure it is completely empty and has been cleaned thoroughly — residual fuel vapors can trigger alarms.

Martial arts equipment like nunchucks and brass knuckles is prohibited in all luggage. Bows and arrows are allowed in checked bags only.

Prohibited items that never go in checked bags

Some items are banned from all luggage, checked or carry-on. These include explosives, fireworks, flares, and other pyrotechnic devices. Lighters and lighter fluid are prohibited. Certain chemicals and pesticides are banned. Realistic replicas of firearms or explosives are prohibited because they can trigger security alarms and law enforcement response.

Self-defense items like pepper spray and tear gas are prohibited in checked bags on most airlines, though some allow one 2% by mass tear gas canister in checked luggage if it is equipped with a safety mechanism. Stun guns and tasers are prohibited in all luggage.

Corrosives, oxidizers, and toxic substances are banned. This includes pool chlorine, drain cleaner, and certain paints. If you are unsure whether a chemical is allowed, contact the TSA or your airline before packing.

Weight limits and airline-specific rules

Every airline sets its own weight and size limits for checked bags. Most domestic US airlines allow one free checked bag up to 50 pounds and 62 inches in total dimensions (length + width + height). A second checked bag usually costs $35 to $50. Exceeding the weight limit results in an overweight fee, typically $100 or more per bag.

International airlines and budget carriers have stricter limits. Some allow only 44 pounds per bag or charge for the first checked bag. Measure your bag and weigh it before you leave home using a bathroom scale or a luggage scale. If your bag is close to the limit, remove items rather than risk paying a fee at the airport.

Some airlines restrict certain items beyond TSA rules. For example, some prohibit more than a certain number of batteries or limit the size of sporting equipment. Check your airline's baggage policy on their website or call their baggage department before packing.

Frequently Asked Questions

Can I pack a lighter or matches in checked luggage?

No. Lighters and lighter fluid are prohibited in both carry-on and checked bags on all flights. Matches are also prohibited in checked bags; only one book of safety matches is allowed in carry-on bags. If you smoke, plan to purchase lighters or matches at your destination.

Are power banks and phone chargers allowed in checked bags?

Yes, but with limits. Power banks with lithium batteries are allowed in checked bags only if they are in original retail packaging or have tape over the terminals. You may pack up to two spare lithium batteries. Regular phone chargers without batteries are allowed in both carry-on and checked bags with no restrictions.

Can I pack my laptop in a checked bag?

Yes, but it is not recommended. Checked bags are handled roughly, and laptops can be damaged, stolen, or lost. If you must check a laptop, pack it in a protective case and consider removing the battery if possible. Keep valuable electronics in your carry-on bag instead.

What happens if I pack a prohibited item by mistake?

If a prohibited item is found during baggage screening, the TSA will remove it and may dispose of it. You will not be notified, and you will not be reimbursed. If the item is dangerous, you may face fines or legal consequences. Always review the TSA website or call ahead if you are unsure about an item.

Do international flights have different checked baggage rules?

Yes. International flights follow TSA rules for US departures, but the destination country may have additional restrictions. Some countries prohibit certain items entirely or require special permits. Check the customs and import rules for your destination country before packing, especially for items like medications, food, plants, or animal products.