US Patent 10287084 Container assembly for separated flowable containers

A container assembly consisting of an outer container and an inner container is provided. The outer container has a recess that conforms in its shape to the shape of the inner container, whereby a cavity is formed in the outer container between the outer walls of the outer container and the walls of the recesses. When the containers are filled with flowable materials and are assembled, both flowable materials are isolated from each other and are not miscible. The containers have engageable threads on the mating surfaces so that the inner container can be inserted into the outer container by twisting. The unique feature of the assembly is a provision of one, two, or three locking means for securing the containers in the assembled state.