KLM Royal Dutch Airlines is known to be relatively strict regarding hand luggage dimensions, especially on fully booked flights or smaller regional aircraft. Their standard policy allows one overhead bag (55 x 35 x 25 cm) and one personal item, with a combined weight limit of 12 kg for Economy. At many airports, particularly at their hub in Amsterdam Schiphol, KLM employs sizers at check-in counters and boarding gates. Ground staff may visually inspect bags and request that they be placed in the metal sizer if they appear over-limit. If your bag exceeds these dimensions or the weight limit, you may be forced to check it into the hold, which often incurs a last-minute gate-check fee. It is highly recommended to measure your bag including wheels and handles, as even a slight protrusion can prevent it from fitting in the sizer, leading to unexpected costs and the inconvenience of losing access to your belongings during the flight.