The invention relates to improvements in or relating to containers and in particular to a refill for an air freshening or purifying device utilizing a gel fragrance or other gel composition and to a device comprising a base container and a refill. The invention specifically comprises a refill for use with an air freshening or purifying device, said refill comprising a refill container having a gel receiving surface and an opposing rear surface, the gel receiving surface having at least one recess in which is contained a gel composition, wherein the profile of the rear surface inversely corresponds to the profile of the gel receiving surface such that it is provided with at least one projection inversely corresponding to the said recess in the gel receiving surface.