Self-cleaning case for powder cosmetic product

A case for powder cosmetic product comprising:

• a base comprising a cavity for receiving said product, the cavity opening out axially through an opening;
• a sifter arranged in the opening;
• a closing cover configured to be screwed onto the base between a fully unscrewed position and a fully screwed position in which it is axially brought closer to the opening to allow its sealed closure;
• and
• a seal attached to the cover by an upper end which comprises:
• a lateral section elastically deformable in an axial direction;
• a membrane which is attached to a lower end of the deformable section and which comprises a contact face intended to rest on an entire surface of the sifter;
• and
• a chamber delimited between the cover and the membrane, wherein the contact face of the membrane is elastically deformable in flexion so that the contact face conforms to a shape of the sifter when the cover is screwed on, the contact face having relief elements.