What is considered carry-on luggage?

There’s no industry standard for sizes for carry-on luggage, with every airline assigning their own size and weight restrictions. If you want to purchase a carry-on bag that would be accepted by most airlines, then the most common maximum size would be 22 x 14 x 9 inches (56 x 36 x 23 cm), including handles and wheels.

Is a backpack considered carry-on?

A backpack would be considered a carry-on item if it adheres to the maximum size restrictions of a specific airline. Most airlines have a larger size allowance for a standard carry-on piece and slightly smaller one for a personal item (where permitted).

Is there a weight limit for carry-on luggage?

As with size restrictions, there are no industry standards for maximum weight allowances for carry-on luggage. These are defined by each individual airline, with some airlines actually not publishing a specific weight restriction — just that you must be able to lift the bag into the overhead compartment yourself. It’s also worth checking whether the airline’s stated weight allowance applies just to your carry-on piece or whether it applies to the combined weight of your carry-on and personal item.

What is the difference between a personal item and carry-on?

Many airlines allow passengers to bring a personal item in addition to a carry-on bag. A personal item is usually a smaller bag, such as handbag, briefcase, or laptop bag, that can be stored under the seat in front of you. Some airlines specify size and weight restrictions for personal items, while many don’t specify maximum sizes or weights.

What is the standard size of a carry-on bag?

There are no universal standards for carry-on baggage, with each airline setting its own size and weight restrictions. If you want to purchase a bag that adheres to most airline standards, then look for a case that’s no larger than 22 x 14 x 9 inches (56 x 36 x 23 cm), including all handles and wheels.

Is a 24-inch suitcase a carry-on?

A 24-inch suitcase would be considered a carry-on by some airlines — but not all. Some airlines state maximum linear dimension only, so as long as your other 2 measurements are smaller to allow for the 24-inch length, then this would be fine. But generally, a suitcase measuring 22 x 14 x 9 inches would be the most widely accepted. This includes American Airlines and United Airlines.

Does carry-on size include wheels and handles?

Yes, the carry-on size limits include anything attached to the case, including wheels and handles.

Carry-On Luggage Size Chart for 64 Major Airlines [Dimensions, Sizes, and More]

Updated: April 23, 2026, 10:53am CDT

Edited by:

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Table of Contents

Quick Overview of Carry-On Luggage Size Limits by Airline
Carry-On Luggage Size Chart for Major Airlines
Final Thoughts

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If you’re flying domestically or internationally, you need to know what size of luggage you’re allowed to bring. And because every airline sets its own carry-on luggage size restrictions by cabin and route, you can’t assume that what worked for a trip with one ariline will work with another. If you’re not careful, your carry-on bag could be rejected and you could end up paying additional charges.

Below is a chart detailing the most popular airlines’ carry-on restrictions, including the size and weight of a standard carry-on, and whether this varies due to the cabin you’re traveling in.

Quick Overview of Carry-On Luggage Size Limits by Airline

Most major U.S. carriers accept bags up to 22 x 14 x 9 inches (56 x 36 x 23 centimeters), with no weight limit enforced on domestic routes.
International routes usually have weight limits (international carriers typically impose weight limits of 15 to 22 pounds (7 to 10 kilograms).
Budget airlines such as Ryanair, EasyJet, Spirit, and Frontier have the most restrictive policies, with some charging fees for overhead bin access.
Business and first class passengers often receive a higher weight allowance or an additional bag.
The limits on the dimensions for personal items differ from carry-on limits and vary significantly by airline.
Always check the specific airline’s policy before traveling, as limits vary by route and can change.

Carry-On Luggage Size Chart for Major Airlines

When talking about baggage allowances, many airlines refer to “maximum linear dimensions” or something similar. This is merely the number you get when you add the length, width, and depth of a piece of luggage. For example, if you have a suitcase that’s 26 inches long, 20 inches wide, and 16 inches deep, then its linear dimensions are 62 inches.

Unless otherwise specified, the maximum weight allowance is across your standard carry-on luggage and personal item combined.

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Airline	Cabin	Maximum Size	Maximum Weight	Personal Item Maximum Size
Aeromexico	Main	21.5 x 15.7 x 10 inches (55 x 40 x 25 centimeters)	Basic fare: 22 pounds (10 kilograms)	17.72 x 13.78 x 7.87 inches (45 × 35 × 20 centimeters)
	AM Plus		All other fares: 33 pounds (15 kilograms)
	Premier
	Premier One
Air Canada	All (economy basic fare no longer includes carry-on for U.S. and some other destionations)	21.5 x 15.5 x 9 inches (55 x 40 x 23 centimeters)	Undisclosed	17 x 13 x 6 inches (43 x 33 x 16 centimeters)
Air China	Economy, Super Economy: 1 bag	22 x 16 x 8 inches (55 x 40 x 20 centimeters)	11 pounds (5 kilograms)	Unspecified
	Business, first: 2 bags		17 pounds each (8 kilograms)
Air Europa Líneas Aéreas	Economy	21.7 x 13.8 x 9.9 inches (55 x 35 x 25 centimeters)	22 pounds (10 kilograms)	15.7 x 11.8 x 5.9 inches (40 x 30 x 15 centimeters)
	Business: 2 bags		31 pounds total (14 kilograms)
Air France-KLM (With Basic Fare, Carry-On Is Not included)	Economy: 1 bag	21.7 x 13.8 x 9.9 inches (55 x 35 x 25 centimeters)	26.4 pounds (12 kilograms) total	16 x 12 x 6 inches (40 x 30 x 15 centimeters)
	Premium economy: 2 bags
	Business, La Première: 2 bags		40 pounds (18 kilograms) total
Air India	Economy	21 x 15 x 7 inches (55 x 40 x 20 centimeters) Maximum linear dimensions 45 inches (115 centimeters)	15 pounds (7 kilograms)	15 x 11 x 7 inches (40 x 30 x 20 centimeters) Maximum linear dimensions 35 inches (90 centimeters) Maximum weight 6 pounds (3 kilograms)
	Business and First		22 pounds (10 kilograms)
Aer Lingus	Transatlantic flights	21.5 x 15.5 x 9.5 inches (55 x 40 x 24 centimeters)	22 pounds (10 kilograms)	15.5 x 11.5 x 8 inches (20 x 30 x 20 centimeters)
	Within Europe, regional flights	21.5 x 15.5 x 9.5 inches (55 x 40 x 24 centimeters)	22 pounds (10 kilograms)
Aeroflot	Economy, Comfort	21.7 x 15.7 x 9.8 inches (55 x 40 x 25 centimeters)	22 pounds (10 kilograms)	Maximum linear dimensions 31.5 inches (80 centimeters) Maximum weight 11 pounds (5 kilograms)
	Business		33 pounds (15 kilograms)
Air New Zealand	Economy: 1 bag	21 x 16 x 9 inches (55 x 40 x 23 centmeters) Maximum linear dimensions: 46.5 inches (118 centimeters)	15 pounds (7 kilograms)	Unspecified
	Premium economy, Business Premier, Business Premier Luxe: 2 bags		30 pounds (14 kilograms) total Any 1 item may weigh up to 22 pounds (10 kilograms)
Alaska Airlines	All	22 x 14 x 9 inches (55.88 x 35.56 x 22.86 centimeters)	Unspecified	Unspecified
Allegiant Air	All	22 x 16 x 10 inches (55 x 40 x 25 centimeters)	Unspecified	18 x 14 x 8 inches (45 x 35 x 20 centimeters)
American Airlines	All	22 x 14 x 9 inches (56 x 36 x 23 centimeters)	Unspecified	18 x 14 x 8 inches (45 x 35 x 20 centimeters)
All Nippon Airways (ANA)	All	22 x 16 x 10 inches (55 x 40 x 25 centimeters)	22 pounds (10 kilograms)	Unspecified
Asiana Airlines	Economy: 1 bag	Unspecified Maximum linear dimensions 45 inches (115 centimeters)	22 pounds (10 kilograms)	15.7 x 11.8 x 7.9 inches (40 x 30 x 20 centimeters)
	Business, first: 2 bags		22 pounds (10 kilograms) each
Austrian Airlines	Economy, premium economy: 1 bag	21.6 x 15.7 x 9 inches (55 x 40 x 23 centimeters)	17.6 pounds (8 kilograms)	5.7 x 11.8 x 5.9 inches (40 x 30 x 15 centimeters)
	Business, first: 2 bags		17.6 pounds (8 kilograms) each
Avianca, TACA	Basic fare: No bag	22 x 14 x 10 inches (55 x 35 x 25 centimeters)	22 pounds (10 kilograms)	18 x 14 x 8 inches (45 x 35 x 20 centimeters)
	All fares (except Basic): 1 bag
British Airways	All	22 x 18 x 10 inches (56 x 45 x 25 centimeters)	Unspecified. You must be able to lift the bag into overhead compartment unassisted.	16 x 12 x 6 inches (40 x 30 x 15 centimeters)
Brussels Airlines	Economy: 1 bag	21.6 x 15.7 x 9 inches (55 x 40 x 23 centimeters)	17.6 pounds (8 kilograms)	15.7 x 11.8 x 5.9 inches (40 x 30 x 15 centimeters)
	Premium economy: 1 bag		17.6 pounds (8 kilograms)
	Business: 2 bags		17.6 pounds (8 kilograms) each
Cape Air	All	Maximum linear dimensions 45 inches (115 centimeters)	Unspecified	Maximum linear dimensions of 36 inches (91 centimeters); other restrictions may apply on specific flights
Caribbean Airlines	All	22 x 14 x 9 inches (56 x 35 x 23 centimeters)	22 pounds (10 kilograms)	17 x 13 x 6 inches (43 x 33 x 15 centimeters)
Cathay Pacific Airways (excluding Flights Between Hong Kong (HKG) and Auckland (AKL) or Christchurch (CHC))	Economy, premium economy: 1 bag	22 x 14 x 9 inches (56 x 36 x 23 centimeters)	15 pounds (7 kilograms)	16 x 12 x 6 inches (40 x 30 x 15 centimeters)
	Business: 1 bag		22 pounds (10 kilograms)
	First: 1 bag		33 pounds (15 kilograms)
China Eastern Airlines	Economy, premium economy: 1 bag	22 x 16 x 8 inches (55 x 40 x 20 centimeters)	17.6 pounds (8 kilograms)	No personal item
	Business, Premium Business, first: 2 bags		22 pounds (10 kilograms) each
China Southern Airlines	Economy, premium economy: 1 bag	22 x 16 x 8 inches (55 x 40 x 20 centimeters)	17.6 pounds (8 kilograms)	Unspecified
	First, business: 2 bags		17.6 pounds (8 kilograms) each
Copa Airlines	All	22 x 14 x 10 inches (56 x 36 x 26 centimeters)	22 pounds (10 kilograms)	17 x 10 x 9 inches (43 x 25 x 22 centimeters)
Delta Air Lines	All	22 x 14 x 9 inches (56 x 35 x 23 centimeters)	Weight restrictions on certain routes	Unspecified
EasyJet Airline	All	22 x 17.7 x 9.8 inches (56 x 45 x 25 centimeters)	33 pounds (15 kilograms) Available for purchase from 5.99 pounds (about $7.50) (tk cannot verify the rate)	17.7 x 14.2 x 7.9 inches (45 x 36 x 20 centimeters) Max weight 33 pounds (15 kilograms)
El Al Israel Airlines (Flights to North America)	Economy: 1 bag	22 x 17.7 x 9.8 inches (56 x 45 x 25 centimeters)	17.6 pounds (8 kilograms)	15 x 11.8 x 7 inches (38 x 30 x 18 centimeters)
	Premium: 2 bags		26.5 pounds (12 kilograms) total Any 1 piece can weigh up to 17.6 pounds (8 kilograms)
	Business: 2 bags		44.1 pounds (20 kilograms) total Any 1 piece can weigh up to 35.3 pounds (16 kilograms)
Emirates	Economy	21.6 x 14.9 x 8.6 inches (55 x 38 x 22 centimeters)	15 pounds (7 kilograms)
	Premium economy		22 pounds (10 kilograms)
	Business, first		15 pounds (7 kilograms)	15 pounds (7 kilograms), size restrictions apply
Etihad Airways	Economy	22 x 14.2 x 9 inches (56 x 36 x 23 centimeters)	15 pounds (7 kilograms)	No personal item
	Business, first: 2 bags		26.5 pounds (12 kilograms) total	15.3 x 9 x 7.5 inches (39 x 23 x 19 centimeters) Maximum weight 11 pounds (5 kilograms)
Eurowings	SMART: 1 bag	21.7 x 15.7 x 9 inches (55 x 40 x 23 centimeters)	17.6 pounds (8 kilograms)	15.7 x 11.8 x 9.8 inches (40 x 30 x 25 centimeters)
	BIZclass: 2 bags
EVA Air	Economy, premium economy: 1 bag	22 x 14 x 9 inches (56 x 36 x 23 centimeters)	15 pounds (7 kilograms)	16 x 12 x 4 inches (40 x 30 x 10 centimeters)
	Royal Laurel, Premium Laurel, business: 2 bags		15 pounds (7 kilograms) each
Ethiopian Airlines	Economy: 1 bag	21.7 x 15.7 x 9 inches (55 x 40 x 23 centimeters)	15 pounds (7 kilograms)	Maximum weight 11 pounds (5 kilograms)
	Business: 2 bags		15 pounds (7 kilograms) each
Finnair	Economy Superlight	21.7 x 15.7 x 9.1 inches (55 x 40 x 23 centimeters)	Not included	15.7 x 11.8 x 5.9 inches (40 x 30 x 15 centimeters)
	Economy Light, Classic, Flex and premium economy Light, Classic, Flex: 1 bag		17.6 pounds (8 kilograms)
	Business Light, Classic, Flex: 1 bag		26.5 pounds (12 kilograms)
Frontier Airlines	All (only a personal item is included, carry on is available for purchase)	24 x 16 x 10 inches (60.96 x 40.64 x 25.4 centimeters)	35 pounds (15.9 kilograms)	18 x 14 x 8 inches (45.72 x 35.56 x 20.32 centimeters)
Garuda Indonesia	Economy	22 x 14 x 9 inches (56 x 36 x 23 centimeters) For CRJ and ATR aircraft: 16 x 13.4 x 6.7 inches (41 x 34 x 17 centimeters)	15 pounds (7 kilograms)	Unspecified
	Business, first	22 x 14.2 x 9.1 inches (56 x 36 x 23 centimeters)
Hainan Airlines (U.S. Departures Only)	Economy class: 1 bag	Domestic flights: 21.7 x 15.7 x 7.9 inches (55 x 40 x 20 centimeters) International or regional flights:maximum linear dimensions 45 inches (115 centimeters)	Domestic flights: 15 pounds (7 kilograms) International or regional flights: 22 pounds (10 kilograms) U.S. departures: 22 pounds (10 kilograms)	12 x 12 x 8 inches (30 x 30 x 20 centimeters)
	Business class: 2 bags		Domestic flights: 15 pounds (7 kilograms) each International or regional flights: 22 pounds (10 kilograms) each U.S. departures: 22 pounds (10 kilograms) each
Hawaiian Airlines	All	22 x 14 x 9 inches (55.9 x 35.5 x 22.9 centimeters)	25 pounds (11 kilograms)	Unspecified
Iberia	Economy, premium economy: 1 bag	22 x 15.7 x 9.8 inches (56 x 40 x 25 centimeters)	22 pounds (10 kilograms)	15.7 x 11.8 x 5.9 inches (40 x 30 x 15 centimeters)
	Business class (short- or medium-haul): 1 bag		30 pounds (14 kilograms)
	Business class (long-haul): 2 bags
Icelandair	All classes: 1 bag Saga Premium Flex permitted 2 bags	21.6 x 15.7 x 7.8 inches (55 x 40 x 20 centimeters)	International flights: 22 pounds (10 kilograms) Domestic flights and Greenland: 13 pounds (6 kilograms)	15.7 x 11.8 x 5.9 inches (40 x 30 x 15 centimeters)
ITA Airways	All	21.7 x 15.7 x 9 inches (55 x 40 x 23 centimeters)	17.6 pounds (8 kilograms)	15.7 x 11.8 x 5.9 inches (40 x 30 x 15 centimeters)
Japan Airlines	All	22 x 16 x 10 inches (55 x 40 x 25 centimeters)	22 pounds (10 kilograms)	Unspecified
JetBlue Airways	All	22 x 14 x 9 inches (55.88 x 35.56 x 22.86 centimeters)	Unspecified	17 x 13 x 8 inches (43.2 x 33 x 20.32 centimeters)
Korean Air Lines	Economy, Premium : 1 bag	21.6 x 15.7 x 7.9 inches (55 x 40 x 20 centimeters)	22 pounds (10 kilograms)	15.7 x 11.8 x 5.9 inches (40 x 30 x 15 centimeters)
	First, Prestige: 2 bags		40 pounds (18 kilograms)
Kuwait Airways	Economy: 1 bag	22 x 18 x 10 inches (56 x 46 x 25 centimeters)	15 pounds (7 kilograms)	Unspecified
	Business, first, Royal: 1 bag		24 pounds (11 kilograms)
Lufthansa	Economy, premium economy: 1 bag	21.6 x 15.7 x 9 inches (55 x 40 x 23 centimeters)	17.6 pounds (8 kilograms)	15.7 x 11.8 x 5.9 inches (40 x 30 x 15 centimeters)
	Business, first: 2 bags		17.6 pounds (8 kilograms) each
Norwegian	LowFare (free personal item only)	21.6 x 15.7 x 9 inches (55 x 40 x 23 centimeters)	22 pounds (10 kilograms)	15.7 x 11.8 x 7.9 inches (40 x 30 x 20 centimeters)
	LowFare+, Flex
			33 pounds (15 kilograms)
Philippine Airlines	All	22 x 14 x 9 inches (56 x 36 x 23 centimeters)	15 pounds (7 kilograms)	2 personal items are permitted Small bag dimensions: 18 x 14 x 8 inches (45 x 35 x 20 centimeters)
Qatar Airways	Economy: 1 bag	20 x 15 x 10 inches (50 x 37 x 25 centimeters)	To/From Brazil: 22 pounds (10 kilograms) All other routes: 15 pounds (7 kilograms)	Unspecified
	Business, first: 2 bags		33 pounds (15 kilograms) total
Qantas Airways	Economy: 1 bag or 1 nonrigid garment bag	Carry-on: 22 x 14 x 9 inches (56 x 36 x 23 centimeters) Garment bag: 44 x 23 x 4 inches (114 x 60 x 11 centimeters)	15 pounds (7 kilograms)	Unspecified
	Premium economy, business, first: 1 or 2 bags plus 1 nonrigid garment bag	You can choose either 1 larger carry-on: 22 x 14 x 9 inches (56 x 36 x 23 centimeters) or 2 smaller carry-ons: 18 x 13 x 9 inches (48 x 34 x 23 centimeters) Garment bag: 44 x 23 x 4 inches (114 x 60 x 11 centimeters)	Up to 22 pounds (10 kilograms) per piece Total weight up to 30 pounds (14 kilograms)
	Domestic flights: 1 bag plus 1 underseat bag or nonrigid garment bag	Carry-on: 22 x 14 x 9 inches (56 x 36 x 23 centimeters) Underseat bag: 18 x 13 x 9 inches (48 x 34 x 23 centimeters) Garment bag: 44 x 23 x 4 inches (114 x 60 x 11 centimeters)	Up to 22 pounds (10 kilograms) per piece
RyanAir	Regular, Flexi Plus, Family Plus: 1 bag	21.7 x 15.7 x 7.9 inches (55 x 40 x 20 centimeters)	22 pounds (10 kilograms)	5.7 x 11.8 x 7.9 inches (40 x 30 x 20 centimeters)
	Other fares (carry-on available for purchase)
Scandinavian Airlines (SAS)	SAS Light: 1 bag (domestic flights and flights within Europe only get a personal item)	21.7 x 15.7 x 9 inches (55 x 40 x 23 centimeters)	17.6 pounds (8 kilograms)	15.7 x 11.8 x 5.9 inches (40 x 30 x 15 centimeters)
	SAS Standard, Flex: 1 bag (domestic flights and flights within Europe)	21.7 x 15.7 x 9 inches (55 x 40 x 23 centimeters)	17.6 pounds (8 kilograms)
	SAS Premium Standard, Flex: 2 bags (domestic flights and flights within Europe only get 1 bag)
	SAS Business, Business Flex: 2 bags (domestic flights and flights within Europe only get a one bag)
Singapore Airlines	Economy, premium economy: 1 bag	45 inches (115 centimeters) maximum linear dimensions	15.4 pounds (7 kilograms)	15.7 x 11.8 x 3.9 inches (40 x 30 x 10 centimeters)
	Suites, business, first: 2 bags		15.4 pounds (7 kilograms) each
Southwest Airlines	All	24 x 16 x 10 inches (60.9 x 40.6 x 25.4 centimeters)	Unspecified	16.25 x 13.5 x 8 inches (41 x 34.3 x 22 centimeters)
Spirit Airlines	Value Fare: None (available for purchase)	22 x 18 x 10 inches (56 x 46 x 25 centimeters)	Unspecified	18 x 14 x 8 inches (45 x 35 x 20 centimeters)
	Premium economy, Spirit First: 1
Sunwing Airlines	All	22 x 14 x 9 inches (56 x 36 x 23 centimeters)	Unspecified	16 x 13 x 6 inches (40 x 33 x 16 centimeters)
Swiss International Air Lines	SWISS Economy, SWISS premium economy: 1 bag	21.7 x 15.7 x 9 inches (55 x 40 x 23 centimeters)	17.6 pounds (8 kilograms)	15.7 x 11.8 x 5.9 inches (40 x 30 x 15 centimeters)
	SWISS Business, SWISS First: 2 bags
Transportes Aéreos Portugueses (TAP) Air Portugal	Economy: 1 bag	22 x 16 x 10 inches (55 x 40 x 25 centimeters)	22 pounds (10 kilograms)	16 x 12 x 5 inches (40 x 30 x 15 centimeters); maximum weight 4.4 pounds (2 kilograms)
	Business (to or from North America): 1 bag
	Business (to or from Europe, Africa, South America, or domestic flights): 2 bags
Thai Airways	Economy, Economy Plus: 1	22 x 18 x 10 inches (56 x 45 x 25 centimeters)	15 pounds (7 kilograms)	15 x 10 x 5 inches (37.5 x 25 x 12.5 centimeters); maximum weight 1.5 kilograms (3.3 lbs)
	Royal First, Royal Silk: 2
Turkish Airlines	Economy: 1 bag	21.6 x 15.7 x 9 inches (55 x 40 x 23 centimeters)	17.6 pounds (8 kilograms)	15.7 x 11.8 x 5.9 inches (40 x 30 x 15 centimeters); maximum weight 8.8 pounds (4 kilograms)
	Business: 2 bags		17.6 pounds (8 kilograms) each
United Airlines	All	22 x 14 x 9 inches (56 x 35 x 23 centimeters)	Unspecified	17 x 10 x 9 inches (43 x 25 x 22 centimeters)
Virgin Atlantic	Economy, premium economy: 1 bag	22 x 14 x 9 inches (56 x 36 x 23 centimeters)	22 pounds (10 kilograms)	16 x 12 x 6 inches (40 x 30 x 15centimeters)
	Upper Class: 2 bags		26 pounds (12 kilograms) each 35 pounds (16 kilograms) total
VIVA Aerobus	None (personal item only)	22 x 16 x 10 inches (55 x 40 x 25 centimeters)	22 pounds (10 kilograms) to purchase	18 x 14 x 8 inches (45 x 35 x 20 centimeters)
	Switch: 1		22 pounds (10 kilograms)
	Smart: 1		33 pounds (15 kilograms)
Volaris	None (personal item only)	22 x 16 x 10 inches (55.9 x 40.6 x 25.4 centimeters)	44 pounds (20 kilograms) available for purchase	Unspecified
	Basic (personal item only)		44 pounds (20 kilograms) available for purchase
	Plus		44 pounds (20 kilograms)
WestJet	All (excluding UltraBasic fare) UltraBasic fare on domestic routes: 1 personal item	22 x 14 x 9 inches (56 x 36 x 23 centimeters)	Unspecified	16 x 13 x 6 inches (41 x 33 x 15 centimeters)

Hot Tip:

Read about covered checked luggage sizes and allowances in a separate article. You can also learn how to avoid paying for baggage fees.

Final Thoughts

It’s always imperative that you check an airline’s baggage size and weight restrictions when flying with an airline, especially if you’re fling internationally. Carry-on size limits vary significantly across airlines (with most U.S. carriers accepting bags up to 22 x 14 x 9 inches), and international carriers typically impose weight limits that U.S. domestic carriers do not. If you’re flying with a budget airline, double-check their luggage size requirements, as these tend to have the most restrictive policies.

The chart above is updated regularly, but it’s important for you to check on the airline itself to ensure you don’t end up paying surprise extra baggage fees when you fly.