Mega container vessels present challenges for supply chains. Their large size (up to 15,000 TEU) leads to port congestion, increased transit times, and higher risks of disruption. Mega ships have also disrupted carrier markets, reducing competition as carriers overinvested to maintain market share. While sea transport costs may decrease, total supply chain costs may not due to increased handling and regional transport expenses. Supply chains need to consider adjusting networks to main ports, extending sea legs with transhipments, contracting alternative routing for risk reduction, and improving container tracking to respond to challenges from mega ships.