Key takeaways
- Carry-on bag: Goes in the overhead bin. This is the bag subject to the 22 x 14 x 9 inch standard. Maximum linear dimensions (height + width + depth) is usually 45 inches.
- Personal item: Goes under the seat in front of you. Typically limited to 18 x 14 x 8 inches (45 x 35 x 20 cm) for US majors, and as small as 15.7 x 11.8 x 7.8 inches (40 x 30 x 20 cm) for Ryanair and similar ultra-low-cost carriers.
Dimensions for carry-on luggage in the United States are typically 22 x 14 x 9 inches (56 x 36 x 23 cm) including wheels and handles, but exact limits range from as small as 21.6 x 15.7 x 7.8 inches for strict low-cost carriers to as large as 24 x 16 x 10 inches for airlines like Southwest.
If your bag is even half an inch over in any dimension, it can be forced to the gate-check, especially on full flights and European budget airlines where sizers are enforced at the gate. Understanding how airlines measure and how to measure your own bag correctly is what determines whether it stays with you in the cabin.
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Standard Carry-On vs. Personal Item: What Counts
Airlines distinguish two cabin bags, and they have very different size limits:
- Carry-on bag: Goes in the overhead bin. This is the bag subject to the 22 x 14 x 9 inch standard. Maximum linear dimensions (height + width + depth) is usually 45 inches.
- Personal item: Goes under the seat in front of you. Typically limited to 18 x 14 x 8 inches (45 x 35 x 20 cm) for US majors, and as small as 15.7 x 11.8 x 7.8 inches (40 x 30 x 20 cm) for Ryanair and similar ultra-low-cost carriers.
The carry-on limit always includes everything – wheels, telescoping handle, front pockets, and any bulge when fully packed. Airlines do not subtract 2 inches for wheels. If the sizer door won’t close, the bag doesn’t fly free.
Airline Carry-On Size Limits Compared for 2026
There is no single FAA or IATA-mandated size. Each airline sets its own maximum and enforcement varies by route, aircraft, and how full the flight is. The table below shows published cabin bag limits for major airlines as of early 2026. All dimensions are listed as Height x Width x Depth and include wheels and handles.
| Airline | Max Carry-On Dimensions (inches) | Max Carry-On Dimensions (cm) | Personal Item Limit | Weight Limit |
|---|---|---|---|---|
| American Airlines | 22 x 14 x 9 | 56 x 36 x 23 | 18 x 14 x 8 in / 45 x 35 x 20 cm | No weight limit, must lift unassisted |
| Delta Air Lines | 22 x 14 x 9 | 56 x 36 x 23 | 18 x 14 x 8 in / 45 x 35 x 20 cm | No weight limit |
| United Airlines | 22 x 14 x 9 | 56 x 36 x 23 | 17 x 10 x 9 in / 43 x 25 x 22 cm | No weight limit |
| Southwest Airlines | 24 x 16 x 10 | 61 x 41 x 25 | 18.5 x 13.5 x 8.5 in / 47 x 34 x 22 cm | No weight limit |
| JetBlue | 22 x 14 x 9 | 56 x 36 x 23 | 17 x 13 x 8 in / 43 x 33 x 20 cm | No weight limit |
| Alaska Airlines | 22 x 14 x 9 | 56 x 36 x 23 | 17 x 11 x 9.5 in / 43 x 28 x 24 cm | No weight limit |
| Spirit Airlines | 22 x 18 x 10 | 56 x 46 x 25 | 18 x 14 x 8 in / 45 x 35 x 20 cm | Fees apply if over; no published kg cap |
| Frontier Airlines | 24 x 16 x 10 | 61 x 41 x 25 | 14 x 18 x 8 in / 36 x 46 x 20 cm | No weight limit for cabin |
| British Airways | 22 x 18 x 10 | 56 x 45 x 25 | 16 x 12 x 6 in / 40 x 30 x 15 cm | 51 lbs / 23 kg combined |
| easyJet | 22 x 18 x 10 | 56 x 45 x 25 | 18 x 14 x 8 in / 45 x 36 x 20 cm | 33 lbs / 15 kg |
| Ryanair | 21.6 x 15.7 x 7.9 | 55 x 40 x 20 | 15.7 x 11.8 x 7.9 in / 40 x 30 x 20 cm | 22 lbs / 10 kg |
| Emirates | 22 x 15 x 8 | 55 x 38 x 20 | Included in allowance | 15 lbs / 7 kg |
| Lufthansa | 21.6 x 15.7 x 9 | 55 x 40 x 23 | 15.7 x 11.8 x 3.9 in / 40 x 30 x 10 cm | 17.6 lbs / 8 kg |
Takeaway: A 22 x 14 x 9 inch bag will pass on all major US legacy carriers, but it will fail on Ryanair, and may be tight on Lufthansa and Emirates due to depth. If you fly low-cost carriers in Europe or Asia regularly, aim for 21.6 x 15.7 x 7.9 inches or smaller to be universally compliant.
Why 22 x 14 x 9 Became the US Standard
Overhead bin dimensions on Boeing 737 and Airbus A320 family aircraft, which operate most domestic flights, are designed around a 22-inch tall roller. A 45 linear inch bag maximizes bin space while still allowing the bin door to close. Hard-sided rollers that are listed as 22 inches often measure 23 to 23.5 inches with wheels, which is why many travelers get stopped despite buying a bag labeled carry-on.
How to Measure Your Bag Correctly Including Wheels and Handles
Manufacturers sometimes list body dimensions only. Airlines measure the absolute outermost points. Do it this way at home:
- Use a flat wall and floor: Stand the bag upright against a wall on a hard floor, fully packed and zipped, with the telescoping handle fully retracted.
- Measure height: From the floor (bottom of wheels) to the highest point of the handle housing or fabric, not just the case body. Place a hard book flat on top and measure from floor to book underside.
- Measure width: Across the widest point, including side pockets and any side handle protrusion.
- Measure depth: From the back of the bag to the front of the fullest pocket, including wheels that stick out behind. For spinners, this includes the full wheel housing.
- Check the sizer trick: Add 0.5 inch to each dimension for fabric bulge. Soft bags can expand by 1-2 inches when overpacked, which is enough to fail a rigid metal sizer at the gate.
If you don’t have a large caliper, use two straight edges or books to create a right angle around the bag and measure between them with a tape measure. Measure twice – once empty and once packed for a typical 3-4 day trip.
Will Your Bag Actually Fit? A Worked Sizing Check
Before you buy, do this 30-second calculation to see if a listed bag is truly compliant. Use a popular 22-inch roller as an example that is advertised as 22 x 14 x 9.
Example bag specs from product listing: Body 21.5 x 14 x 9 inches, wheels add 2 inches to height, handle housing adds 0.5 inches to depth.
- True height = 21.5 + 2 = 23.5 inches
- True width = 14 inches (no change)
- True depth = 9 + 0.5 = 9.5 inches
- True linear = 23.5 + 14 + 9.5 = 47 inches
Result: Even though the listing says 22 x 14 x 9, the real travel size is 23.5 x 14 x 9.5 and 47 linear inches. This bag will pass on Southwest and Frontier (24 x 16 x 10) but will be flagged as oversized on American, Delta, United, and JetBlue, and will definitely be gate-checked on Ryanair and Lufthansa.
When shopping, look for bags explicitly listed as 21.5 inches or less in height including wheels, or with dimensions stated as inclusive. For hard cases from brands like Samsonite, Travelpro, Away, and LEVEL8, check the spec sheet line that says overall dimensions or packing dimensions.
Choosing the Right Carry-On Size for Your Travel Pattern
The best dimensions depend on where and how you fly most often, not just the maximum allowed.
| Your Situation | Best Target Size | Why It Works |
|---|---|---|
| Only US major airlines (American, Delta, United) | 22 x 14 x 9 in / 56 x 36 x 23 cm | Maximizes capacity while staying within the strictest US legacy limit. No need to downsize. |
| Mix of US majors and European low-cost carriers | 21.6 x 15.7 x 7.9 in / 55 x 40 x 20 cm | Meets Ryanair, Wizz Air, and Lufthansa limits. You sacrifice about 8-10 liters but avoid fees. |
| Frequent international long-haul with weight limits | 21.5 x 13.5 x 7.5 in lightweight frame (2.5-3.2 kg empty) | Keeps you under 7-8 kg limits for Emirates, Qatar, and Lufthansa. Every kilogram of bag weight matters. |
| Budget traveler on Spirit/Frontier Basic fares | Focus on personal item: 18 x 14 x 8 in | Both charge for overhead carry-ons on bare fares. A max-size personal item backpack avoids the fee entirely. |
| Overpacker or 5+ day trips | 22 x 14 x 9 with expansion zipper (adds 2 in depth) | Fly compressed to meet sizer, expand only when checking on return or when airline allows it. |
Capacity reference: A true 22 x 14 x 9 inch roller holds roughly 35-45 liters depending on wheel and handle intrusion. A 21.6 x 15.7 x 7.9 inch cabin bag holds about 30-36 liters. Hard-sided cases lose 2-4 liters to shell thickness and telescoping handle channels.
Common Mistakes That Get Bags Gate-Checked
- Trusting the tag size: A bag labeled 22 inch is often 23+ inches overall. Always verify overall dimensions, not body dimensions.
- Packing the front pocket full: A laptop or toiletry bag in the front compartment can add 1-1.5 inches of depth and make the bag fail the sizer. Pack flat items at the back.
- Forgetting the sizer is rigid: Soft duffels can be squished in to fit, but hard rollers cannot. If you fly carriers with metal sizers, a soft-sided bag gives you more forgiveness.
- Ignoring personal item enforcement: On Spirit, Frontier, and Ryanair, the personal item is measured separately and more strictly than the carry-on. An overstuffed backpack that won’t fit under the seat will be charged at the gate at a much higher rate than online.
- Assuming domestic rules apply internationally: US airlines rarely weigh cabin bags, but most European and Asian airlines do. A bag that is perfect in size can still be gate-checked for being overweight at 7-10 kg.
If you are between sizes, the safer investment is a spinner in the 20-21.5 inch overall height range with a 14-inch width and 8-9 inch depth. It will board without question on virtually every airline and still hold enough for a 3-5 day trip with efficient packing. For longer trips, pairing that carry-on with a compliant personal item tote or backpack adds 15-20 liters without risking overhead bin rejection.
FAQ
Do wheels and handles count toward carry-on dimensions?
Yes, for every major airline. The measurement is taken from the lowest point of the wheels to the highest point of the handle housing, and from the rearmost to foremost protrusion. Some retailers list body-only dimensions to make bags seem smaller.
What happens if my bag is 1 inch too big?
On US legacy carriers with lenient enforcement, you might still board if bins are not full and the bag is soft-sided. On full flights and on low-cost carriers, gate agents will require you to place it in the sizer, and if it does not fit, you will pay a gate-checked bag fee, which is often higher than the pre-booked checked bag fee.
Is there a universal carry-on size that works everywhere?
No single size works on all airlines worldwide without compromise, but 21.5 x 13.5 x 7.5 to 21.6 x 15.7 x 7.9 inches will pass even the strictest published limits in the table above while still being useful for most trips.
