What Size Carry-On Luggage Fits in the Overhead Bin? | The 22 x 14 x 9 Rule

American, Delta, United, Alaska, and JetBlue all publish that same limit, making it the safest widely accepted size for domestic travel. Measure your bag with wheels, handles, and external pockets included—not just the shell. If you’re shopping, this guide covers the measurements that matter, the catches, and the bags that make the cut.

Why 22 x 14 x 9 Inches Is the Number to Know

The major US carriers settled on 22 x 14 x 9 inches as their standard overhead-bin maximum, the closest thing to a universal size for domestic flying. A bag that fits slides into bins on nearly every US route without a gate-check scramble. That doesn’t mean every bin accepts it—capacity varies by aircraft, and published limits are rules, not guarantees. But it’s the most broadly compatible target. Watch out: dimensions include everything sticking out—wheels, handles, and external pockets all count. Measure the bag as it sits on the floor, wheels and handle fully extended.

The IATA Cabin OK Guideline Is Not a Standard

The international benchmark quoted is 55 x 35 x 20 cm, roughly 21.5 x 13.5 x 7.5 inches, sold as “Cabin OK.” IATA states this is a voluntary guideline for manufacturers, not a standard airlines enforce. For US travelers, it’s a safe floor, not a ceiling. A Cabin OK bag fits virtually anywhere, including stricter European budget carriers; a 22 x 14 x 9 bag handles US flights but may get flagged internationally. Regional and budget carriers diverge: Ryanair’s priority carry-on allows 55 x 40 x 20 cm, Wizz Air’s runs 55 x 40 x 23 cm, with weight limits often 8–10 kg, compared to . Many US full-service carriers publish no domestic weight limit.

Common Carry-On Sizing Mistakes

Most gate-check surprises trace back to one of four errors:

• Measuring the shell only. Wheels, handles, and pockets count—a 21-inch shell with 2-inch wheels is a 23-inch bag.
• Assuming one global standard exists. The US standard, IATA guideline, and European budget limits are all different.
• Confusing a personal item with a carry-on. Personal items go under the seat; carry-ons go overhead, with separate limits.
• Assuming one airline’s acceptance means all. A bag fine on Delta can fail on Ryanair.

The fix: measure once, with everything attached, against the 22 x 14 x 9 target, and confirm any specific airline’s chart before flying.

When buying, look for a bag meeting the 22 x 14 x 9 spec with room to spare, and check the wheel design—where many exceed the limit. Our tested roundup of 4 wheel carry on luggage picks focuses on models that fit the standard bin.

How to Measure Your Carry-On Correctly

Lay the bag flat with wheels down and handle fully extended. Measure the longest point in each direction: height from floor to top of handle, width across the front, and depth front to back including wheels. Measure depth with external pockets empty—a fully packed pocket can add an inch. At or under 22 x 14 x 9, you’re set for most US flights; over by an inch or two, you’re gambling. For international budget travel, size down toward the IATA guideline and mind the weight.