In Economy Class, you are always permitted to bring one checked bag with a maximum size is 158 cm (L+ H+W) and weight of 23 kg. In Business Class, you are always permitted to bring two pieces of check-in baggage, each weighing no more than 32 kg and size not exceed 158 cm (L+ H+W).

KLM is generally considered very strict regarding baggage policies in 2026, particularly when it comes to the "Light" and "Basic" fare categories. For a standard checked bag, the maximum size is 158 cm (length + width + height), including handles and wheels, with a weight limit of 23 kg (50 lbs). While gate agents might occasionally overlook a few centimeters on a soft-sided bag, they frequently use laser measuring tools and digital scales at major hubs like Amsterdam Schiphol to ensure compliance. If your bag exceeds these limits, you will likely face significant excess baggage fees, which are much higher at the airport than if prepaid online. For Business Class or Flying Blue elite members, the rules are slightly more flexible with higher weight allowances (up to 32 kg), but the physical size limit of 158 cm remains a firm standard across the airline to ensure efficient loading of the aircraft's hold.