If the flight is very full then they. Maximum size 45x36x20cm, including handles and wheels. As a regular passenger on kl they are not too strict with carry on size.
KLM Luggage Allowance Excess Baggage Fees Sherpr
check out these great top tips for travelling light with just hand luggage, too. you can bring your instrument as hand baggage, checked baggage or transport it on an extra seat, depending on the size and weight. 55 x 35 x 25cm (including wheels and handles) if you’re travelling in economy class on european and intercontinental flights, you’ll be limited to the one main hand. each airline has slightly different rules for hand luggage allowances on international flights, with the weight, size and even number of bags different from one.
