Systems, devices, and methods including a swirl shake weight

A multi-phase cosmetic composition mixing pack for mixing immiscible components of a multi-phase cosmetic composition such that they are temporarily miscible, the mixing pack comprising:

• a container for holding the multi-phase cosmetic composition, the container having a first open end and a container longitudinal axis;
• and
• a mixing element disposed within the container and configured to be actuated for mixing immiscible components of the multi-phase cosmetic composition such that they are temporarily miscible, wherein the mixing element is limited to movement substantially along the container longitudinal axis when actuated, wherein the mixing element is a shake weight comprising:
• a substantially cylindrical body having a hollow interior extending between first and second ends, the first end defined by a continuous upper perimeter of the body and the second end defined by a continuous lower perimeter of the body;
• and
• a plurality of openings defined in the substantially cylindrical body that allow for the flow of the multi-phase cosmetic composition into and out of the hollow interior.