Consumers' group Facua has made an official complaint to the ministries for Infrastructure and Health over Ryanair's plans to change its hand baggage policy from 1 November.
Facua, along with other watchdogs, says that the move by the budget airline contravenes Spanish legislation.
Ryanair has said it will stop automatically storing hand luggage free of charge in the hold for non-priority customers. Instead passengers will pay around eight to ten euros to store a normal-sized piece of hand luggage in the hold or upgrade as priority passengers to take hand luggage in the cabin. A smaller, under-seat bag can still be taken on free of charge by everyone.
Groups in Spain say the policy goes against aviation law that obliges airlines to take people's hand luggage on board in cabins except where weight or plane- size restrictions do not allow it.
Ryanair has hit back saying that, "no airline allows passengers to carry all their suitcases into the aeroplane cabin".