IATA hand luggage standard: what is the guideline?
- · Updated on , by Miquell Hellings
- 5 min read
Are you looking for the IATA carry-on luggage standard? Then you mainly want to know one thing: which size is safe to take into the cabin. The short answer is that IATA has mentioned a guideline, but airlines continue to apply their own carry-on luggage rules in practice. That is why it is best to see the IATA size as a reference and always check the rules for your airline and ticket.
What is the IATA carry-on luggage standard?
The IATA carry-on luggage standard usually refers to a proposed cabin suitcase size of 55 x 35 x 20 cm. IATA is the international trade association for airlines. The idea behind such a standard is simple: less confusion for travellers and fewer discussions when boarding.
It is important to note that this is not a globally binding rule that automatically applies to every airline. Many airlines use different dimensions, and the permitted weight and rules for an additional personal item also often vary.
Does this standard apply to all airlines?
No. That is exactly where much of the confusion comes from. Even if an airline uses common carry-on luggage sizes, that does not mean it follows the IATA guideline literally. Some airlines allow more space, while others are stricter.
In practice, you should always check three points:
- Dimensions of the carry-on luggage
- Maximum weight
- Whether an additional personal item is allowed on the plane, such as a handbag, laptop bag or small backpack
Rules may also differ depending on the ticket type. Basic or light fares often include less than a standard economy ticket.
Why do airlines differ from the IATA guideline?
Airlines determine their own baggage policies. They do this based on factors such as cabin capacity, operational choices and their fare structure. Especially with airlines that offer different ticket levels, carry-on luggage is often part of the pricing model.
As a result, a suitcase that can travel without any problems with one airline may be too deep, too wide or too heavy for another. A return flight with a different airline may therefore also have different requirements from your outbound flight.
Which size is most commonly used in practice?
There is no single universal size, but cabin formats around 55 cm in height are common on the market, with variations in width and depth. Many travellers choose formats such as 55x40x20 carry-on luggage: complete guide, 55 x 35 x 25 cm or similar combinations. That does not mean they are accepted everywhere.
Also remember that airlines usually use the outside dimensions. Wheels, handles and protruding parts are therefore included. This is exactly where things often go wrong at the airport.
What does this mean when choosing a carry-on suitcase or backpack?
If you often travel with different airlines, it is wise not to look only at a general standard, but mainly at how you travel yourself. A compact model usually offers the most flexibility. If you often travel with an airline that allows more generous cabin dimensions, a larger model may suit you better.
Useful points to consider when choosing:
- Always check the airline and ticket type before departure
- Measure the outside dimensions, including wheels and handles
- Pay attention to the difference between carry-on luggage and a personal item
- Do not look only at litres or the model name, but at the exact centimetres
- Keep the weight in mind, because a suitable suitcase can still be too heavy
At ByMetz, you will find carry-on suitcases and carry-on backpacks in many common airline sizes. Looking for something compact? Take a look at our 40x30x20 bags and underseaters.
The IATA size of 55 x 35 x 20 cm is a guideline, not a mandatory size. If you mainly fly with low-cost airlines, take a look at our 55 x 40 x 20 cm suitcases. If you fly with KLM or Air France, 35 cm is the maximum width, so choose from 55x35x25 carry-on luggage.
What is standard carry-on luggage?
By standard carry-on luggage, people usually mean a cabin suitcase or bag that fits in the overhead compartments above your seat and can be taken into the cabin without being checked in. However, "standard" is not a fixed worldwide size. It is more of a collective term for commonly used carry-on luggage formats.
That makes the term useful as a general search query, but less reliable when you really want to know whether your bag or suitcase is allowed. The airline remains the deciding source for that check.
Practical advice: how to avoid extra costs at the gate
The biggest mistake is relying on a general standard without checking the current airline rules. If your luggage is too large or too heavy, it may still have to be checked into the hold, which can lead to extra costs.
- Check your airline's baggage page shortly before departure
- Compare your suitcase or backpack with the exact permitted size
- Pack important items separately in case your luggage unexpectedly has to be checked in
- When in doubt, choose something more compact rather than one that is right on the limit
FAQ
What are the IATA rules for baggage?
IATA can issue guidelines and proposals, but airlines usually determine their own baggage rules in the end. For carry-on luggage, this means that dimensions, weight and the number of permitted pieces may differ between airlines. For more context, also read this complete guide to carry-on luggage dimensions.
Is 40x30x20 a small suitcase?
40 x 30 x 20 cm generally falls into the category of a compact personal item or small carry-on bag, depending on the airline. This size is especially relevant for airlines that allow a small bag under the seat. Always check whether your airline accepts this size as a free personal item. Also read the overview of 40x30x20 airline rules.