In the last decades container ships became larger and larger. Carriers trying to achieve economies of scale by increasing the container ships. Some links in the supply chain face more challenges because of increasing container ships than others. But what are the implications and consequences of so called mega ships? In this paper the consequences for the carrier market, the consequences for the port authorities and the consequences for container terminals will be discussed. A short overview of relevant thoughts and expectations during three phases will be given. The most important limitations to large container ships are technical - and economical aspects