An economical substitute for wire racks, here are these submersible, autoclabable racks which are stackable when empty. These are available in different colors and are made of a special blend of polypropylene that makes it sink in a water bath and maintain their stability even in agitated water. These space saving racks can easily be disassembled for cleaning purposes. The base is in the form of a grid with square openings and has fold up sides and end bars that lock into rack tops.