Carry-On Luggage Size and Weight Limits

Most airlines allow one carry-on bag and one personal item (like a purse or laptop bag) in the cabin. The carry-on bag must fit in the overhead bin, which is typically 22 inches long, 14 inches wide, and 9 inches tall — though this varies by airline and aircraft type. Weight limits for carry-on bags usually range from 40 to 50 pounds, but the size restriction is what matters most. If your bag is too large, the gate agent will make you check it, even if it's light.

Your personal item is smaller and goes under the seat in front of you. A standard personal item is roughly the size of a backpack or small messenger bag — around 18 inches by 14 inches by 8 inches. Airlines rarely weigh personal items, but they do enforce the size rule because it affects how many bags fit in the cabin.

Before you pack, check your specific airline's website for their exact dimensions. Airlines like Southwest, Delta, United, and American each set their own limits, and some budget carriers like Spirit and Frontier have stricter rules. Measuring your bag at home takes two minutes and saves you from surprises at the airport.

Key Takeaways

  • Carry-on bags must fit in the overhead bin (usually 22 by 14 by 9 inches) and weigh 40 to 50 pounds, though size matters more than weight.
  • You can bring one personal item (backpack, purse, or laptop bag) that fits under the seat in front of you in addition to your carry-on.
  • Checked bags typically allow 50 pounds for domestic flights and 70 pounds for international flights, with size limits around 62 inches total (length plus width plus height).
  • Budget airlines like Spirit and Frontier charge fees for carry-on bags and checked bags, so read their policy before packing.
  • Certain items cannot fly in carry-on or checked luggage, including lighters, sharp objects, and liquids over 3.4 ounces, regardless of bag size.

Checked Baggage Allowances

Checked bags have more generous size limits than carry-on luggage. Most airlines allow checked bags up to 62 inches when you add the length, width, and height together. A standard rolling suitcase fits this limit. Weight limits are usually 50 pounds for domestic flights and 70 pounds for international flights. Going over the weight limit costs extra — typically $35 to $100 per bag, depending on the airline and how much over you are.

Many airlines include one free checked bag for passengers in economy, but this depends on your ticket type and airline. Budget carriers often charge for the first checked bag ($25 to $35), and some charge for a second bag as well. Premium economy and business class passengers usually get two or three free checked bags. Check your airline's baggage policy when you book your ticket, not the day before your flight.

If you're traveling with a partner or family, you can sometimes split luggage across multiple bags to stay under weight limits. A 100-pound suitcase split into two 50-pound bags costs nothing extra, while one 100-pound bag costs a hefty overage fee.

What Counts as Carry-On Versus Checked

The distinction matters because some items are banned from the cabin but allowed in checked luggage. Lighters, for example, cannot go in your carry-on bag but one lighter is allowed in checked baggage. Sharp objects like box cutters and most knives must be checked. Lithium batteries in large quantities must be checked or not flown at all.

Liquids, gels, and aerosols have the strictest rules for carry-on bags: each container must be 3.4 ounces (100 milliliters) or smaller, and all containers must fit in a single quart-sized clear plastic bag. This includes toothpaste, shampoo, conditioner, lotion, sunscreen, and peanut butter. You can bring unlimited quantities of these items in checked bags, as long as they're packed safely so they don't leak on other luggage.

Electronics like laptops, tablets, and cameras go in your carry-on bag. You'll remove them at security screening, but they travel with you in the cabin. Power banks (portable chargers) are allowed in carry-on bags but not in checked bags because of fire risk.

Restricted and Prohibited Items

The Transportation Security Administration (TSA) maintains a list of items that cannot fly at all, items that can only be checked, and items that can only be carried on. Common prohibited items include firearms, explosives, and certain tools. Sporting equipment like baseball bats, golf clubs, and ski poles can be checked but not carried on.

Flammable items — including aerosol cans, certain paints, and some cleaning products — cannot fly in either carry-on or checked baggage. If you're unsure whether something is allowed, search the TSA's "What Can I Bring?" tool on their website before you pack. You can also call your airline directly or ask at the ticket counter, though this takes longer than checking online.

International flights have additional restrictions. Some countries ban items that are legal in the United States, so research your destination's rules if you're flying abroad. Batteries, certain medications, and even some foods may be restricted depending on where you're going.

Budget Airline Baggage Policies

Low-cost carriers like Spirit, Frontier, and Allegiant have stricter baggage rules than major airlines. Spirit charges $35 to $45 for a carry-on bag and $30 to $40 for a checked bag on most routes. Frontier charges $30 for a carry-on and $35 for a checked bag. These fees add up quickly if you're traveling with family or taking multiple trips.

Some budget airlines include a small personal item (like a purse or backpack) for free, but the carry-on bag itself costs extra. If you're flying budget, pack light and use only your personal item if possible. If you need a carry-on, factor the baggage fee into your ticket price before you book — sometimes a more expensive ticket on a major airline is cheaper overall.

Checked bag fees on budget airlines are per bag, per direction. A round trip with one checked bag costs twice the one-way fee. Oversized or overweight bags incur additional charges on top of the base fee.

Packing Tips to Avoid Baggage Problems

Weigh your bag at home before you leave for the airport. Most grocery stores, post offices, and shipping centers have scales you can use for free or a small fee. If your checked bag is close to the weight limit, remove a few items and pack them in your carry-on instead. This takes five minutes and saves you an overage fee.

Pack heavier items at the bottom of your suitcase and lighter items on top. This distributes weight evenly and makes it less likely that your bag will tip over or burst open. Use packing cubes or compression bags to maximize space without adding weight.

Arrive at the airport early enough to repack if needed. If your carry-on is too large, you may have time to move items to your checked bag before you board. Gate agents are more flexible if you ask politely and have time to fix the problem, rather than holding up the boarding line.

International Baggage Rules

International flights often have different baggage allowances than domestic flights. Some airlines use a weight-based system (like 50 kilograms total for all checked bags) instead of a per-bag limit. Others use a piece-based system (like two checked bags per passenger). Check your airline's international baggage policy on their website — it's usually different from their domestic policy.

Baggage allowances also depend on your ticket class and frequent flyer status. Business class passengers typically get 2 or 3 checked bags, while economy gets 1 or 2. Frequent flyer elite members may get an extra checked bag for free. These benefits vary by airline, so review your booking confirmation or call the airline to confirm what you're may have access to to.

If you're flying with a connecting flight, your baggage is usually checked through to your final destination, even if you change airlines. However, if you booked separate tickets for each leg, you'll need to claim and recheck your bags yourself. This matters because baggage allowances may differ between airlines.

Frequently Asked Questions

Can I bring a full-size suitcase as a carry-on?

Most full-size suitcases are too large for the overhead bin. Standard carry-on suitcases are 22 inches long, 14 inches wide, and 9 inches tall. If your suitcase is larger than that, it will be checked at the gate. Measure your bag before you travel to know for sure.

What happens if my bag is overweight at the airport?

You'll be charged an overage fee, usually $35 to $100 per bag depending on how much over the limit you are. You can ask to repack items into your carry-on or personal item if you have room, but the gate agent has the final say. Weighing your bag at home prevents this problem.

Can I bring a backpack as my carry-on instead of a rolling suitcase?

Yes, as long as it fits in the overhead bin. A backpack that's roughly 22 by 14 by 9 inches will work. Keep in mind that a backpack takes up more overhead space than a rolling suitcase because of its shape, so the gate agent may ask you to check it if the bin is full.

Are soft-sided bags better than hard-sided bags for flying?

Soft-sided bags are slightly more flexible and may squeeze into tight overhead bins, but hard-sided bags protect fragile contents better. Either works fine for flying. Choose based on what you're packing and your personal preference.

Do I need to remove my luggage from the overhead bin before landing?

No. Flight attendants will remind you to collect your carry-on bags before exiting the aircraft, but you don't need to remove them until the plane has landed and come to a complete stop. Checked bags are unloaded separately and arrive at baggage claim.