Cosmetic casing comprising a deformable lateral wall

A device for packaging a cosmetic product, comprising:

• a base defining a storage compartment, the base having a central axis;
• a lid mounted movably in rotation on the base about an axis of a hinge between a closed configuration of the device and an open configuration of the device;
• and
• a receptacle containing the product P, delimited by a bottom, an upright wall, and by a lateral wall having a concave central portion, being arranged in the storage compartment, the receptacle being fixed relative to the base,
• wherein the lateral wall of the receptacle comprises an elastically deformable material and a width of the lateral wall is configured to increase through the effect of the base and the lid being brought closer together, forming a sealing gasket coming into contact with the lid in the closed configuration of the device,
• wherein in the closed configuration, an internal wall of the lid contacts an external surface of the lateral wall,
• wherein the concave central portion is located on an internal portion of the lateral wall that faces in a direction of the central axis of the base,
• wherein the upright wall defines a groove at an upper end of the upright wall, and
• wherein the lateral wall includes an upper edge positioned within the groove of the upright wall.