Carry-on luggage dimensions vary by airline, but most follow a standard range of 22 inches long by 14 inches wide by 9 inches tall — though some allow slightly larger bags, and a few enforce stricter limits.

The size limit you need to know depends on which airline you are flying. There is no single rule across all carriers. The Transportation Security Administration (TSA) does not set a maximum carry-on size; instead, each airline decides what fits in its overhead bins and under the seat in front of you. Most major U.S. carriers — including American, Delta, United, and Southwest — accept bags up to 22 × 14 × 9 inches. Budget airlines like Spirit and Frontier often allow smaller personal items (16 × 14 × 8 inches) but charge extra for a standard carry-on bag.

Before you pack, check your specific airline's website or call their customer service line. The dimensions are usually listed under "baggage" or "carry-on policy." If your bag is close to the limit, measure it yourself — airlines sometimes use sizers at the gate, and an oversized bag may be checked at the last minute, which can delay your boarding or cost you a fee.

Key Takeaways

  • Most major U.S. airlines allow carry-on bags measuring 22 × 14 × 9 inches, but budget carriers often enforce smaller limits.
  • The TSA does not set carry-on size limits; each airline makes its own rules.
  • Your airline's website lists exact dimensions under the baggage or carry-on policy section.
  • A bag that is slightly oversized may be checked at the gate without warning, so verify your bag's measurements before traveling.
  • Personal items (purses, small backpacks, laptops) usually have no size limit as long as they fit under the seat.

How Airlines Measure Carry-On Bags

Airlines measure the length, width, and height of your bag and add those three numbers together — this is called the linear dimension or linear inch total. A bag measuring 22 × 14 × 9 inches has a linear dimension of 45 inches. Some airlines state their limit as a total linear dimension (often 45 inches) rather than individual measurements, so read the policy carefully to see which format your carrier uses.

Soft-sided bags (made of fabric) are easier to squeeze into tight spaces than hard-sided luggage, and gate agents know this. A slightly oversized soft bag may pass inspection, while a hard case of the same dimensions will not. That said, do not rely on this — if your bag is visibly larger than the sizer, expect it to be checked.

Differences Between Major Airlines

American Airlines, Delta, United, and Southwest all allow 22 × 14 × 9 inches for carry-on bags. JetBlue and Alaska Airlines follow the same standard. These carriers also permit one personal item (a purse, laptop bag, or small backpack) in addition to your carry-on, with no strict size limit on the personal item as long as it fits under the seat.

Spirit and Frontier are the main exceptions. Spirit's standard carry-on limit is 16 × 14 × 8 inches, and Frontier's is 17 × 10 × 10 inches. Both airlines charge a fee (usually $30 to $45) if you bring a standard-sized carry-on without paying in advance. If you fly these carriers regularly, it may be worth buying a smaller bag to avoid the fee.

International airlines vary widely. If you are flying overseas, check your carrier's policy — some European and Asian airlines allow larger bags (up to 23 × 15 × 10 inches), while others are stricter. Budget carriers like Ryanair and EasyJet in Europe often enforce tight limits similar to Spirit and Frontier.

What Counts as a Personal Item Versus a Carry-On

Most airlines allow you to bring two items into the cabin: a personal item and a carry-on bag. A personal item is typically a purse, laptop bag, small backpack, or briefcase — anything that fits comfortably under the seat in front of you. There is usually no official size limit for personal items, but the rule is that it must not take up floor space or block the aisle.

Your carry-on bag goes in the overhead bin or under the seat if there is room. If the overhead bins are full, the flight attendant may ask you to check your carry-on at the gate, even if it meets the size requirement. This happens more often on crowded flights, so arrive early to find bin space.

How to Measure Your Bag at Home

Use a soft measuring tape or a ruler and measure from the outside of your bag, including wheels and handles. Measure the longest point in each direction: length (top to bottom), width (side to side), and height (front to back). Write down all three numbers and add them together to get your linear dimension.

If your bag is close to the limit, pack it as you would for your trip and measure it again. A full bag may bulge slightly and exceed the stated dimensions. If it does, consider removing items or choosing a smaller bag. Some luggage retailers sell bags labeled "carry-on compliant" for specific airlines, which can save you the guesswork.

What Happens If Your Bag Is Too Large

If your carry-on exceeds the airline's size limit, a gate agent may ask you to check it at no charge (since it is the airline's rule, not your mistake). However, this can delay your boarding and separate you from your bag until you land. On a tight connection, this can be costly.

Some airlines charge a fee for oversized carry-on bags if they catch them at the gate. Spirit and Frontier, for example, may charge $30 to $45 if you bring a standard carry-on without paying the advance fee. To avoid this, measure your bag before you leave home and know your airline's policy.

Tips for Packing Within Size Limits

Choose a bag that is slightly smaller than the maximum allowed — this gives you a margin for error and makes it easier to fit in tight overhead bins. Soft-sided bags compress better than hard cases, so they are a good choice if you are close to the limit.

Pack heavier items at the bottom and lighter items on top. Roll your clothes instead of folding them to save space. Use packing cubes to organize and compress your belongings. If you are traveling for more than a few days, consider checking a bag instead of trying to fit everything into carry-on size.

Frequently Asked Questions

Can I bring a roller bag and a backpack on the plane?

Yes. Most airlines allow one personal item (backpack, purse, or laptop bag) plus one carry-on bag (roller or hard case). The personal item goes under the seat, and the carry-on goes in the overhead bin. If the bins are full, you may be asked to check your carry-on.

Do wheels and handles count toward the size limit?

Yes. Measure your bag from the outside, including wheels, handles, and any pockets that stick out. The TSA and airlines measure the overall footprint of the bag as it sits, not just the interior space.

What if my bag is soft-sided and bulges a little?

Soft bags that bulge slightly may still pass inspection if they fit in the sizer at the gate. However, do not rely on this. If your bag is visibly oversized when packed, it is safer to check it or remove items before boarding.

Are carry-on limits the same on connecting flights?

Yes, as long as you stay with the same airline or a partner airline. If you change airlines, check the second airline's policy — it may have different size limits. Your bag must meet the strictest requirement of any airline on your itinerary.

Can I bring a car seat or stroller as a carry-on?

Car seats and strollers are usually checked for free if you are traveling with a child, even if they exceed carry-on size limits. Tell the gate agent when you board that you have a car seat or stroller, and they will gate-check it (meaning you get it back at the door of the plane). This does not count against your carry-on allowance.