Hand Luggage Allowance (Cabin bags allowance)

What the official page says

1 free underseat cabin bag size (max. 40x30x20 cm). Option of carrying a piece of luggage in the overhead locker (max. 10 kg and 55x40x20 cm) by adding the 2 pieces on board service or choosing Space One, Space Plus or Space seats. 1 free underseat cabin bag size (max. 40x30x20 cm) + 1 piece of luggage in the overhead locker (max. 10 kg and 55x40x20 cm) if you select this luggage option.