a display - type container for cosmetics and the like , includes a flat jar having a neck portion with an external screw thread , and a ring - shaped screw cap member that is mounted on and cooperable with the neck portion . the latter has an annular sealing lip , and a plastic panel member which is disposed in the ring - shaped screw cap member provides underside sealing areas or surfaces that are engaged with the sealing lip . portions of the screw - cap member and panel member are disposed in overlying relation , the two members being centralized with one another , and forming a unitary closure assemblage . the arrangement is such that the sealing areas of the panel member are forced by the screw cap member , into substantially air - tight sealing engagement with the sealing lip of the jar . the seal does not depend on the engagement of the threads , or upon any incidental sealing therebetween , which may or may not occur . the panel member is preferably transparent , to permit viewing of the jar contents , and the screw cap is preferably opaque , to largely conceal its own thread , and that of the jar .