The number of containers carried on an Evergreen container ship varies extensively based on the physical size class of the individual vessel, ranging from smaller feeder ships holding a few thousand units to ultra-large container vessels capable of hauling over twenty-four thousand twenty-foot equivalent units. Mega-ships deployed along primary maritime trading routes between Asia and Europe feature immense structural capacities engineered to stack containers securely across numerous tiers above and below deck. These massive capacities enable the shipping line to achieve immense economies of scale, reducing per-unit transportation costs and optimizing global supply chain logistics.