Abstract: A multi-component mixing device comprising an outer container and an inner vessel. The outer container comprises a closed end, a mouth and a peripheral wall between said closed end and said mouth. The inner vessel is disposed within said outer container and the inner vessel comprises a top portion, a bottom portion and a peripheral side wall between said top portion and bottom portion. The peripheral side wall of the inner vessel is defined by first and second sections, which are slidably engaged to one another between a first position and a second position. In the first position, the inner vessel defines an enclosed cavity and in the second position, the inner vessel comprises a first opening corresponding to the enclosed cavity.