Abstract: A container for liquids is formed of a shell of resilient plastic which defines a hollow body with at least two spaced posts upstanding from one side, and at least two recesses on the opposite side in which the posts of similar containers may be snugly received. One post has an opening at its upper end for filling the container and emptying liquid from it. The container can be used for the packaging and sale of liquids and, after the container has been emptied of its liquid contents, the containers can be used as toy interlocking building blocks. The stacking of the containers with the posts of containers received in the recesses of adjacent containers in interlocking fashion also facilitates the building of walls or other extensive assemblies of the containers for display purposes and the like.