A Spanish court has described the budget carrier Ryanair's policy of taking a charge for hand luggage as "violent" after a passenger was fined for carrying a carrying case without a special ticket.
The passenger was forced to pay a fine of € 20 (£ 1[ads1]7) to bring her 10 kg luggage on board.
Ryanair only allows small bags such as hand luggage if they can be stored under the front seat.
The airline said it would not change its baggage policy.
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The passenger traveled from Madrid to Brussels when she was accused of carrying extra luggage.
The airline has a policy of charging customers an additional fee for carrying anything more than a personal item on board. Larger bags may also require luggage fees.
In its ruling, the commercial court ruled that the woman should be repaid with interest.
It called Ryanair its "baggage" policy of violating the client's legal rights under Spanish law.
The luggage could easily have been fitted in the cabin, the judge said.
It decided the policy was invalid and asked Ryanair to "remove it" from its terms and conditions.
However, compensation was excluded as the judge did not consider the case to have caused enough stress to the dissatisfied passenger.
The airline said it would not change its policy.
"This ruling will not affect Ryanair's luggage policy, either in the past or in the future, as it is an isolated case that misinterpreted our commercial freedom to determine the size of our cabin luggage," a statement said.
The order cannot be appealed.