The Members of the European Parliament also appealed to the European Commission to draft a regulation on carry-on luggage that would end arbitrary policies of some airlines in setting charges and restriction thereon. The European Commission could determine a reasonable hand luggage allowance as well as set a rule that hand luggage would be checked during check-in and not only at the gate. However, the Commissioners don't see it as an issue that needs to be regulated:
"Commissioner De Gucht admitted that hand luggage restrictions vary
greatly but said "the Commission sees this as the reflection of
diversity in a very competitive market", adding that he was not in
favour of more regulatory action." (MEPs urge Commission to draft common rules for carry-on luggage)