A unit for packaging at least one absorbent structure intended to be impregnated with a liquid composition includes at least one component, packaged separately from the absorbent structure. The unit includes a flexible-walled container containing the absorbent structure, and at least one sachet containing the component. The sachet is capable of opening in response to pressure exerted on the sachet via at least one flexible wall of the container so as to cause the absorbent structure to become impregnated with the liquid composition containing the component, the sachet and the absorbent structure being free inside the container. The unit may be used for treatment, particularly cosmetic treatment, of the human skin and its superficial body growths.