What is special in european airlines is the super light economy where you're allowed onboard literally with three panties and a pair of socks as carry-on. 
Nothing bigger than that.

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Unfortunately, it has become the standard.

Only hand luggage on the cheapest fare.

Just 1 of 66 Digital Citizen of Theopetra (theopetralabs.com)

Yes I've got it, yet the difference in luggage size comes when you're packing for six days and you're 170cm tall vs 200cm.