Luggage unpacks how international travel has changed down the ages. Adventurers in the 15th-century age of discovery set sail in galleons loaded to the gunwales with supplies for voyages that might take years. Aristocrats on a “grand tour” in the 18th century trekked around Europe for months in horse-drawn carriages packed with trunks, servants and even furniture. The suitcase arrived at the end of the 19th century when spending several weeks abroad became more common for the wealthy. By the 1970s tourists and executives needed to cart the wherewithal for...