Disclosed is a compact for containing a loose powder, such as cosmetic finishing powder, including a base, a cover, a sifter, and a platform compressible against the sifter. The platform may comprise an inner portion flexibly coupled to an outer portion via a gasket disposed on at least a portion of a bottom surface of the inner portion. The compact may have an open position and a closed position. In the closed position, the cover may apply a downward force on the inner portion, compressing the gasket against the sifter and creating a seal to isolate the loose powder.