A container preassembly which has an inner sleeve in a flat unopened position disposed within an outer sleeve in a flat unopened position. The two sleeves are adapted to form the two ends of the container and are secured together in the aligned relationship of the final open container, thereby allowing the preassembly to be opened into the form of the final container without requiring further adjustment. Once opened, the flaps for forming the container bottom are folded to create a container ready for use. A method of making the container preassembly is also provided.