Hydrocarbon emissions capture canister

Hydrocarbon emission capture canister arranged in a fuel system of a vehicle comprising an assembly (10) comprising a container (12) having an aperture (20) closed by a cover (14). The cover (14) is provided with a protrusion (30) and can be arranged over the aperture (20) so the protrusion (30) protrudes inwardly the container (12) minimizing the internal volume of the container (12) or protrudes outwardly the container (12) maximizing the internal volume of the container (12).