Considerably more detailed and informative than a standard domestic packing list, an export packing list lists seller, buyer, shipper, invoice number, date of shipment, mode of transport, carrier, and itemizes quantity, description, the type of package, such as a box, crate, drum, or carton, the quantity of packages, total net and gross weight (in kilograms), package marks, and dimensions, if appropriate. Both commercial stationers and freight forwarders carry packing list forms. A packing list may serve as conforming document. It is not a substitute for a commercial invoice. In addition, U.S. and foreign customs officials may use the export packing list to check the cargo.