powder has been taken up the user again closes the case 1 the foam slab 7 the piston 4 b and the flexible membrane 4 a reassume their initial position moreover the seal of the case is again ensured until a subsequent use the seal is ensured inter alia by the position of the puff 12 which surmounts the screen 9 without however coming into contact with the screen 9 the case of fig3 differs that of fig2 in that it has a receptacle or refill 13 for the product consisting a product refill accommodated in the opening 3 of the body 5 and having a shape complementary to that of the opening 3 the refill 13 is represented in greater detail in fig4 the refill 13 has a flexible bottom 4 formed by a flexible membrane 4 a made of a thermoplastic elastomer in a twin injection modeling process joined to a rigid cylinderical skirt 14 having an upper peripheral flange 15 the flange 15 has a folded edge 15 a allowing it to be fixed on the case 1 by means of a corresponding annular groove 10 a on the upper surface 5 b of the case a detachable cover 16 protects the product before the first use of the refill and between successive uses optionally the membrane 4 a may comprise a central reinforcing element 4 f which is more rigid than the peripheral zone of the membrane 4 a serving for the gripping of the case in this.