Carry-On Luggage Size Requirements | Airline Rules That Fit

Carry-on luggage size requirements in the U.S. typically cap bags at 22 x 14 x 9 inches, though exact limits vary by airline.

Most major U.S. carriers size carry-on luggage at 22 x 14 x 9 inches, including wheels and handles. That is the number gate agents check; the TSA leaves the decision to each airline, stating dimensions vary by carrier. Travelers who skip measuring risk an oversized bag at the gate and a last-minute check fee. Below is the current U.S. standard, how to measure correctly, and key exceptions.

What Is The Standard Carry-On Size For U.S. Airlines?

The dominant U.S. standard is a bag no larger than 22 x 14 x 9 inches, always including wheels and handles. Both American Airlines and United Airlines publish exactly this limit. Those numbers trace to an FAA guideline noting the maximum carry-on for most airlines is 45 linear inches (22 + 14 + 9 = 45), which shapes the standard. However, that figure is a reference point, not a universal regulation, and airlines may adjust sizes.

How To Measure A Carry-On Bag Correctly

Measuring is straightforward, but one mistake causes most rejections: leaving out wheels or handles. American and United both explicitly include these parts in stated limits.

• Lay the bag flat and measure full height, width, and depth, with wheels and handles extended or counted.
• Pack the bag before measuring—a stuffed bag can bulge past stated dimensions.
• Check the bag against the airline’s sizer box at the airport if unsure.
• Separate carry-on luggage from your personal item; the personal-item limit is smaller and has its own rules.

A “carry-on” label on a bag’s tag is not a guarantee—airlines reject bags exceeding their published sizer dimensions even if the manufacturer marketed the bag for cabin use.

How The Major U.S. Airlines Compare

American Airlines caps carry-on luggage at 22 x 14 x 9 inches, including handles and wheels. United Airlines uses the same 9 x 14 x 22 inch limit with the same measuring requirements. These two set the de facto U.S. standard.

Other U.S. carriers may post different numbers, so the official airline page remains the final word. The TSA’s position is direct: “Size dimensions of carry-on baggage allowed in the cabin of the aircraft vary by airline.” The TSA’s carry-on size FAQ confirms the agency does not set one universal number.

Weight Limits And The Carry-On Vs. Personal Item Distinction

Size is not the only constraint, and carry-on luggage is not the only bag. Airlines often enforce separate, smaller limits for a personal item—a backpack, purse, or laptop bag that fits under the seat—distinct from the overhead-bin carry-on and not governed by the 22 x 14 x 9 formula. A compliant carry-on avoids gate-check fees and baggage-carousel waits. Travelers comparing models for teens will find fitting picks in this roundup of carry-on luggage for teens.