"Post-Panamax" refers to a class of large container ships that are too big to pass through the original Panama Canal locks, which were completed in 1914. These vessels typically exceed a width of 32.3 meters (106 feet) and can carry over 12,000 twenty-foot equivalent units (TEUs). The term emerged after the expansion of the canal in 2016, which allowed larger ships to transit. The expansion project, known as the Panama Canal Expansion, added new locks that accommodate these larger vessels, significantly impacting global shipping routes. As a result, many ports around the world have upgraded their facilities to handle the increased size and capacity of Post-Panamax ships.