A customs document is an official document that is required for international travel. It includes a VISA (4 letters), which is a document that grants permission to enter a country, a PASSPORT (8 letters), which is an official document that identifies a person as a citizen of a particular country, a MANIFEST (8 letters), which is a list of goods being transported, a carnet (6 letters), which is a document that allows duty-free import and export of goods, and a travel VISA (10 letters), which is a document that grants permission to travel to a foreign country.