A modular interconnecting knockdown container system includes a plurality of individual containers selectively coupled together to form a free standing unit. Each container is a knockdown container formed from a single substrate assembled into the container having a plurality of side members and extending between opposed ends of the container. Each container includes a plurality of coupling tabs adjacent each container end on at least two of the sides, wherein each tab may selectively extend beyond the adjacent container end. Each container includes a plurality of coupling tab receiving slots adjacent each container end on at least two sides at each container end and aligned with the coupling tabs adjacent the container end, wherein each tab receiving slot may selectively receive a tab of an adjacent container. Adjacent containers have the coupling tabs adjacent one end received within the tab receiving slots of an adjacent end of an adjacent container.