In Spain, as in most countries in the European Union, airlines are the ones that set the rules on the size and weight of suitcases and carry-on luggage. These rules can vary between different airlines, so it is important to check the specific policies of the airline you are traveling with.
In general, carry-on luggage measurements are usually around 55 cm x 40 cm x 20 cm, and the weight can range from 7 kg to 10 kg, depending on the airline. Checked bags usually have weight limits ranging from 20 kg to 32 kg.
At airports, security and airline personnel are quite strict with luggage measurements and weight. If your suitcase exceeds the allowed dimensions or weight, you will likely be asked to check it in, which may entail an additional cost.
Therefore, it is advisable to check your airline’s baggage policies before travelling and to measure and weigh your luggage to avoid surprises at the airport.