A Spanish court has called the budget airline Ryanair's policy to charge an "excessive" baggage charge after a passenger was fined for taking a bag without a special ticket.
The passenger was forced to pay 20 € (£ 1
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 bag policy.
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The passenger traveled from Madrid to Brussels when she was accused of bringing her 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 a luggage fee.
In the judgment of the Court, the Commercial Court decided that the woman should be repaid with interest.
The luggage could easily have been mounted in the cabin, the judge said.
It decided that the policy would be invalid and told Ryanair to "remove it" from its terms.
However, compensation is excluded because the judge did not consider that the case had caused enough stress for the unhappy passenger.
The airline said it would not change its policy.
"This decision will not affect Ryanair's luggage policy, either past or future, because it is an isolated case that misunderstood our commercial freedom to determine the size of our cabin luggage," it said in a statement.
The judgment cannot be appealed.