This depends on specific requirements from the airline both in terms of dimensions and total weight. But since most 20-inch suitcases and luggage are found in the 30-40 liters range, this means you'll likely be fine using it as such.
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Though you might find an inch or two of a difference with various airlines, the standard domestic carry-on luggage size is 22 x 14 x 9, which includes the handle and the wheels. This size limit ensures your bag — and ideally everyone else's — will be able to be stored safely in the overhead bin for your flight.
Can a 24 inch luggage be a carry on? Unfortunately no, the standard carry-on size is typically 22” x 14” x 9”, so a 24 inch bag is too large to bring on board of most economy standard airlines.
Carry-on bags shouldn't be larger than 22 inches long, 14 inches wide and 9 inches high including handles and wheels. Dimensions of personal items should not exceed 18 inches long, 14 inches wide and 8 inches high. There are no weight restrictions for carry-on luggage.
Is a 24-inch Carry-On Too Big? Most airlines can accommodate a 24-inch carry-on, but not all. Generally, a carry-on suitcase measuring 22 inches x 14 inches x 9 inches, commonly seen as 22 x 14 x 9, would be the most widely accepted size.
Most airlines will allow you to check one bag and have one carry-on bag. There is normally a maximum weight limit of 50 pounds per checked bag as well as a size restriction. The most common maximum size bag allowed is 62 linear (total) inches. A common size bag for checking through is: 27 x 21 x 14.
If your checked bag is over 62 linear inches (157 cm), it will be marked as oversized. This is a rule set by airline regulators to protect baggage handlers from any potential injuries.
If your carry-on is oversized (and doesn't physically fit inside the overhead compartments) or you encounter a strict airline employee, they will ask you to check it in at the gate.
What's the Size of a 20-Inch Suitcase or Luggage? The typical size of 20-inch suitcases or luggage ranges between 30-40 liters with maximum dimensions of around 21 x 14 x 9 inches (53 x 36 x 23 cm).
In general, standard domestic carry-on luggage size is 22 x 14 x 9 inches. If you're flying internationally, that may vary a little to 21.5 x 15.5 x 9 inches. Remember, those dimensions include the handle, wheels and anything else that may protrude from your suitcase so don't miss them from your measurements.
Carry-on bags are limited to 22 inches long, 14 inches wide and 9 inches high including wheels and handles. All three measurements shouldn't add up to more than 45 inches.
23 - 24 Small Checked LuggageThese sizes are popular for travelers looking for a smaller, lighter option of luggage to check. These pieces are too large to carry onto the plane, but are perfect for trips of 3 to 5 days.
The large cabin suitcase usually measures 55 cm or 20 inches in height and has a capacity of up to 45 litres. Large cabin bags are perfect for short-haul flights, trips which last only a few days. If you are looking for standard-sized cabin luggage, this is your best option.