a three - piece package comprises a median supporting frame to which a dished base and a dished cover are latched by means of double - acting latch elements integral with the supporting structure , all three parts being preferably thermoformed plastic to provide the package in one , two , or three colors . the supporting structure may include an integral platform having one or more cavities therein to accommodate as many articles and may also support a decorative peripheral band or may comprise a frame with either an open interior with unobstructed space between the base and cover of the package or a separate platform with a cavity or cavities .