All imported goods must be presented to the appropriate Customs office and declared for clearance. Goods imported into Switzerland must be declared within the following time limits from arrival in the country by various means of transportation: road, 24 hours; river, 48 hours; rail, 7 days; and air, 7 days. The importer may examine goods before submitting them for clearance. For Swiss Customs purposes, an ordinary commercial invoice in duplicate or triplicate is considered sufficient documentation. The invoice should contain the following details: description of the products and packaging, gross and net weight of each package, quantity (in metric terms), country of origin, and CIF value to the Swiss border.