Airline Carry-On and Checked Bag Dimensions
Most airlines allow one carry-on bag and one personal item (like a purse or laptop bag) in the cabin, plus checked luggage in the cargo hold. The size limits differ by airline, but the standard carry-on maximum is roughly 22 inches long by 14 inches wide by 9 inches tall. This is the industry standard set by the International Air Transport Association, though some airlines enforce it strictly while others are more lenient.
Checked bags typically have a size limit of 62 inches when you add length plus width plus height together. Most airlines allow two checked bags per passenger on domestic flights, though the second bag often costs extra. International flights may have different rules, and budget carriers frequently charge for the first checked bag or limit you to one.
The actual dimensions matter less than whether your bag fits the airline's sizer—a metal or plastic frame at the gate that your carry-on must fit through. If it does not fit, you will be asked to check it, and you may pay a fee. Checked bags are weighed, and overweight fees start around $35 to $50 per bag depending on the airline.
Key Takeaways
- Carry-on bags must fit in the overhead bin and typically measure no more than 22 by 14 by 9 inches, though some airlines allow slightly larger bags.
- Checked bags can be up to 62 inches (length plus width plus height) and usually weigh no more than 50 pounds on domestic flights.
- Each airline sets its own size and weight rules, so checking your specific airline's website before packing saves time and fees at the airport.
- Personal items like backpacks, purses, and laptop bags do not count toward your carry-on allowance and have no official size limit on most carriers.
- Budget airlines and international carriers often charge for checked bags or enforce stricter size limits than full-service carriers.
How to Measure Your Luggage Correctly
Measure your bag from the outside, including wheels and handles. Use a soft measuring tape or a ruler, and measure the longest point in each direction. For a rectangular suitcase, measure from the bottom corner to the top corner along the length, then the width at the widest point, then the height including the handle when it is fully extended.
For checked bags, add all three numbers together. If your bag measures 28 inches long, 20 inches wide, and 12 inches tall, that is 60 inches total—within the 62-inch limit. For carry-on bags, the airline will tell you the maximum for each dimension separately, not a total. Write down your bag's measurements and keep them handy; you may need them when booking or at check-in.
Carry-On Bag Rules by Airline Type
Full-service carriers like American, Delta, United, and Southwest typically allow carry-on bags up to 22 by 14 by 9 inches. They also include a personal item at no extra cost. Most of these airlines let you bring a second checked bag for a fee, usually $35 to $45 on domestic flights.
Budget airlines like Spirit and Frontier have stricter rules. Spirit charges for any checked bag and limits carry-ons to bags that fit under the seat in front of you—roughly 16 by 14 by 8 inches. Frontier allows a free carry-on but charges for checked bags. Allegiant Air charges for both carry-on and checked bags unless you purchase a bundle.
International carriers vary widely. European airlines like Ryanair and EasyJet charge for checked bags and have small carry-on limits. Asian carriers like Singapore Airlines and Cathay Pacific often allow larger carry-ons and include one or two checked bags. Always check the airline's website before booking an international flight.
Weight Limits and Overweight Fees
Checked bags on domestic flights are usually limited to 50 pounds. Some airlines allow up to 70 pounds on international flights, but that varies. Overweight fees typically start at $35 for bags between 50 and 70 pounds, and jump to $75 or more for bags over 70 pounds. A few airlines charge per pound once you exceed the limit.
Carry-on bags do not have an official weight limit on most airlines, but they must fit in the overhead bin. If your carry-on is so heavy that you cannot lift it safely, a flight attendant may ask you to check it. Weigh your bag at home before you go to the airport—most luggage stores and many grocery stores have scales you can use for free or a small fee.
What Happens If Your Bag Is Too Large
If your carry-on does not fit in the sizer at the gate, you will be asked to check it. Some airlines charge a gate-check fee of $25 to $50 if overhead bins are full. If your checked bag exceeds the size or weight limit, you will pay an overweight or oversized fee before your bag goes on the plane. These fees are non-refundable.
To avoid this, pack strategically: put heavy items in your checked bag, not your carry-on. Wear your bulkiest items (like a winter coat) onto the plane instead of packing them. Roll clothes instead of folding them to save space. If you are traveling with a full suitcase, weigh it at home and measure it before you leave for the airport.
Luggage Types and Their Typical Dimensions
A carry-on suitcase is usually 22 by 14 by 9 inches and holds about 40 liters. These are rigid or semi-rigid and fit in the overhead bin. A personal item like a backpack or messenger bag is smaller—roughly 16 by 12 by 8 inches—and fits under the seat in front of you. A checked suitcase comes in two sizes: a medium bag (24 by 16 by 10 inches, about 60 liters) and a large bag (28 by 20 by 12 inches, about 85 liters).
Soft-sided bags compress slightly, which can help them fit in tight spaces, but they do not change the official dimensions. Hard-sided luggage is more durable but takes up the same space. Spinner wheels (four wheels that rotate) make bags easier to maneuver in tight aisles, while two-wheel bags are lighter but harder to steer. Choose based on how much you pack and how far you walk through airports.
International Flight Luggage Rules
International flights often have different rules than domestic flights. Many international carriers allow two checked bags instead of one, but some charge for the second. Carry-on limits are usually the same as domestic flights. However, some European budget airlines have much stricter carry-on rules—Ryanair, for example, limits free carry-ons to personal-item size.
If you are flying to another country and then connecting to a domestic flight within that country, check both airlines' rules. Your bag may be checked through to your final destination, but if you have a long layover or are changing airlines, you may need to collect and re-check your bag. Always verify the rules for every airline on your itinerary before you pack.
Frequently Asked Questions
Can I bring a full-size suitcase as a carry-on?
No. Full-size checked suitcases (28 by 20 by 12 inches) are too large for the overhead bin. You need a carry-on suitcase, which is smaller and designed to fit. If you try to bring a checked suitcase to the gate, you will be asked to check it, and you may pay a fee.
Do I have to pay for a second checked bag?
On most full-service airlines, yes—the second checked bag costs $35 to $50 on domestic flights. Some airlines include it for free if you have elite frequent-flyer status or a premium credit card. Budget airlines charge for any checked bag. Check your airline's website or your booking confirmation to see what is included.
What if my luggage is one inch over the size limit?
It depends on the airline and how strictly they enforce the rule. Some airlines use a sizer and will not allow bags that do not fit through it. Others measure with a tape and may allow a small overage. The safest approach is to stay within the stated limits. If your bag is close, arrive early so you have time to repack or check it if needed.
Are there size limits for soft-sided bags or duffel bags?
Yes. Soft-sided bags are measured the same way as hard-sided luggage—from the outside, including any bulges. A duffel bag that measures 24 by 16 by 10 inches when packed counts as a checked bag, not a personal item, even though it is soft. Measure your bag when it is fully packed to know whether it fits the limit.
Do I need to remove my luggage from the sizer before boarding?
Yes. The sizer is only at the gate to check whether your bag fits. Once it passes, you can take it out and place it in the overhead bin or under the seat. If it does not fit, the gate agent will tell you to check it or repack it before you board.