Receptacle intended to regulate the atmosphere in a container for storing sensitive products, wherein the receptacle is designed for forming a chamber which is at least partially filled with an active substance, the receptacle comprising two main elements: - a first element (30; 50) comprising: - a transverse wall (14; 54) with a first main side (16; 56) facing the interior of the chamber; and - a peripheral wall (18; 58) integrally formed with the first main side (16; 56) of the transverse wall (14; 54); and - a second element comprising: - a bottom wall; and - a sheath extending from the bottom wall and being integrally formed with the bottom wall; wherein - the peripheral wall (18; 58) of the first element (30; 50) and the sheath of the second element are dimensioned and mutually arranged to surround one another in contact with each other in abutting regions so that the inner volume of the chamber capable of receiving the active substance is delimited by the bottom wall of the second element, the transverse wall (14; 54) of the first element (30; 50) and either the peripheral wall (18; 58) of the first element (30; 50) or the sheath of the second element; and - at least one ventilation groove, formed as a recess in at least one of the first and second elements, is provided between the peripheral wall (18; 58) of the first element (30; 50) and the sheath of the second element, preferably running in a direction perpendicular to the bottom wall, characterized in that at least one radial passage, formed as a recess in at least one of the first and second elements, is provided to connect the ventilation groove with the inner volume of the chamber, such that the ventilation groove and the radial passage form at least a part of a ventilation path connecting the chamber with the atmosphere in the container. - a first element (30; 50) comprising: - a transverse wall (14; 54) with a first main side (16; 56) facing the interior of the chamber; and - a peripheral wall (18; 58) integrally formed with the first main side (16; 56) of the transverse wall (14; 54); and - a transverse wall (14; 54) with a first main side (16; 56) facing the interior of the chamber; and - a peripheral wall (18; 58) integrally formed with the first main side (16; 56) of the transverse wall (14; 54); and - a second element comprising: - a bottom wall; and - a sheath extending from the bottom wall and being integrally formed with the bottom wall; wherein - a bottom wall; and - a sheath extending from the bottom wall and being integrally formed with the bottom wall; wherein - the peripheral wall (18; 58) of the first element (30; 50) and the sheath of the second element are dimensioned and mutually arranged to surround one another in contact with each other in abutting regions so that the inner volume of the chamber capable of receiving the active substance is delimited by the bottom wall of the second element, the transverse wall (14; 54) of the first element (30; 50) and either the peripheral wall (18; 58) of the first element (30; 50) or the sheath of the second element; and - at least one ventilation groove, formed as a recess in at least one of the first and second elements, is provided between the peripheral wall (18; 58) of the first element (30; 50) and the sheath of the second element, preferably running in a direction perpendicular to the bottom wall,