What goes in your luggage depends on where you're flying and what the airline allows

Most airlines let you pack everyday items — clothes, toiletries, books, electronics — in checked luggage without restriction. The real limits come from three places: what's actually prohibited by law (explosives, certain chemicals), what your specific airline bans, and what will damage your bag or other passengers' belongings during transport. A checked bag gets thrown, stacked, and pressurized, so packing smart means understanding both the rules and the physical reality of how luggage travels.

Carry-on bags have stricter rules because they stay with you in the cabin. Liquids, gels, and aerosols must follow the 3-1-1 rule: containers of 3.4 ounces or smaller, all fitting in one quart-sized clear bag, one bag per person. Sharp objects, tools, and anything that could be used as a weapon are prohibited in carry-on but often allowed in checked bags. Knowing the difference between these two categories saves you from having items confiscated at security.

Key Takeaways

  • Checked luggage allows most everyday items including clothes, shoes, books, and electronics, but liquids over 3.4 ounces must go in checked bags, not carry-on.
  • Prohibited items in both checked and carry-on bags include explosives, flammables, compressed gases, and certain chemicals — check your airline's website for their specific list.
  • Sharp objects like knives, razors, and tools can go in checked luggage but not in carry-on bags you bring into the cabin.
  • Batteries, power banks, and lithium devices have special rules and often require advance notice to the airline if you're packing large quantities.
  • Packing heavy items on the bottom and fragile items in the middle of your bag, surrounded by soft clothing, prevents damage during handling.

Liquids, gels, and aerosols: the 3-1-1 rule for carry-on

If you're bringing liquids or gels into the cabin, each container must be 3.4 ounces (100 milliliters) or smaller. This includes shampoo, conditioner, lotion, toothpaste, deodorant, sunscreen, and makeup. All containers go into one clear quart-sized plastic bag — the kind you can buy at any drugstore or get free at airport security. You're allowed one bag per person.

Checked luggage has no size limit for liquids, so pack full-sized bottles there instead. This is where your regular shampoo bottle, face wash, and other toiletries belong if you want to bring more than travel sizes. Make sure containers are sealed tightly so they don't leak onto your clothes during the flight. If you're worried about spills, wrap bottles in plastic bags or place them in a separate toiletry case.

Aerosols like spray deodorant, hairspray, and spray sunscreen follow the same 3.4-ounce rule for carry-on. In checked bags, aerosols are allowed but must have safety caps to prevent accidental discharge. Some airlines limit the number of aerosol cans per bag, so check your carrier's rules before packing.

Sharp objects and tools: what stays in checked luggage

Knives, razors, scissors, and box cutters cannot go in carry-on bags. They must be packed in checked luggage, and they should be sheathed or wrapped so they don't puncture the bag or injure baggage handlers. This includes kitchen knives, pocket knives, and safety razors. Disposable razors with the blade covered are sometimes allowed in carry-on, but it's safer to pack them checked.

Tools like screwdrivers, hammers, wrenches, and saws belong in checked bags only. Nail clippers and tweezers are allowed in carry-on because they're small and not considered weapons. If you're traveling with sports equipment like golf clubs or baseball bats, those go in checked luggage and may require advance notice to your airline.

If you need a knife or tool at your destination, consider buying it there instead of packing it. Many travelers find this simpler than managing checked-bag rules, especially on short trips.

Electronics, batteries, and power banks

Laptops, tablets, phones, cameras, and headphones are fine in both carry-on and checked bags. Keep electronics in carry-on when possible so they don't get damaged during baggage handling. Remove them from your bag at security screening so they can be scanned separately.

Batteries and power banks have special rules because lithium batteries can overheat. Standard AA and AAA batteries are allowed in both carry-on and checked bags. Lithium-ion batteries (the kind in phones, laptops, and power banks) are allowed in carry-on bags but restricted in checked bags — most airlines allow only two spare lithium batteries per person in carry-on, and they must be in your personal bag, not checked. Large power banks over 100 watt-hours may be prohibited entirely, so check your airline's policy before packing.

If you're bringing multiple devices or large batteries, contact your airline in advance. Some carriers require you to declare them, and a few have stricter limits than others. This is especially important if you're traveling internationally, where rules vary by country.

Clothing, shoes, and personal items

Pack as many clothes and shoes as your luggage weight limit allows. Most airlines allow one checked bag of 50 pounds and one carry-on bag of 22 pounds, though this varies by carrier and ticket type. Roll clothes instead of folding them to save space and reduce wrinkles. Shoes can be stuffed with socks or small items to maximize space.

Belts, scarves, hats, and jewelry go in either bag without restriction. Underwear, socks, and accessories have no limits. If you're packing formal wear, consider a garment bag or lay it flat on top of other items to prevent creasing.

Swimsuits, workout clothes, and seasonal items are all fine. The only clothing restriction is that you can't pack anything that's wet or damp, as it can damage other items and create mold during the flight.

Prohibited items you cannot pack at all

Explosives, fireworks, and ammunition are completely prohibited in both checked and carry-on bags. Flammable liquids like gasoline, lighter fluid, and paint thinner cannot be packed. Compressed gases including propane, oxygen, and aerosol cans with flammable contents are banned. Certain chemicals, pesticides, and corrosive substances are also prohibited.

Realistic toy guns or replica firearms may be confiscated or cause serious problems at security, so leave them at home. Lighters are restricted — you can bring one lighter in your checked bag if it has a safety mechanism, but not in carry-on. Matches are prohibited in both.

If you're unsure whether something is allowed, check your airline's website or call them before you pack. Different carriers have slightly different rules, and it's better to know in advance than to have an item taken away at the airport.

How to pack fragile items and valuables

Place heavy items like shoes and books on the bottom of your checked bag. Surround fragile items — glasses, electronics, souvenirs — with soft clothing like sweaters and socks. This cushioning absorbs impact during baggage handling. Wrap breakable items individually in clothing or bubble wrap if you have it.

Keep valuables like jewelry, important documents, medications, and expensive electronics in your carry-on bag, not checked luggage. Checked bags can be lost, delayed, or damaged, and airlines have limits on what they'll reimburse. Your carry-on stays with you the entire flight.

If you're packing something particularly valuable or fragile, consider purchasing additional baggage insurance through your airline or a third-party provider. Some credit cards offer baggage protection as a cardholder benefit, so check your card's terms.

International travel: additional restrictions

Some items allowed in the United States are prohibited in other countries. Certain medications, plant materials, and animal products require documentation or are banned entirely. If you're traveling internationally, research your destination country's customs rules before packing.

Duty-free items purchased at the airport can go in checked bags, but not in carry-on if you're connecting through another country. Alcohol and perfume have specific quantity limits depending on your destination. Meat, dairy, and fresh produce are often prohibited, so avoid packing homemade food items.

When in doubt, pack light and buy items at your destination. This is especially true for toiletries and medications, which are widely available and easier than managing international restrictions.

Frequently Asked Questions

Can I pack a full-sized bottle of shampoo in my checked bag?

Yes. Checked luggage has no size limits for liquids. Pack full-sized bottles there instead of carry-on, where the 3.4-ounce limit applies. Make sure the cap is tight so it doesn't leak onto your clothes during the flight.

Are hair straighteners and curling irons allowed in luggage?

Hair styling tools with cords are allowed in both carry-on and checked bags. Battery-powered cordless tools are also fine. Let them cool completely before packing, and wrap the cord so it doesn't tangle or damage other items.

Can I pack my laptop in a checked bag?

Technically yes, but it's not recommended. Checked bags get thrown and stacked, which can damage electronics. Keep your laptop in your carry-on bag where you can protect it. If you must check it, wrap it in soft clothing and place it in the center of your bag, surrounded by cushioning.

What happens if I accidentally pack a prohibited item?

Security will find it during screening. If it's in your carry-on, you'll be asked to remove it, throw it away, or mail it to yourself. If it's in checked luggage, you may be notified after the flight, or the item may be confiscated. To avoid this, check your airline's prohibited items list before packing.

Do I need to declare my power bank or large battery to the airline?

Most standard power banks under 100 watt-hours don't require declaration and can go in carry-on. Larger batteries or multiple batteries should be declared in advance. Contact your airline before your trip if you're packing anything over 100 watt-hours or multiple lithium batteries.