The invention relates to a protective and packaging wrapper for a container, the wrapper being constituted by a sleeve of heat-shrink plastics material for shrinking onto the container, said sleeve being obtained from a film that is folded in half and looped by bonding together two corresponding end zones. In accordance with the invention, the film constituting the sleeve is opaque to light over its entire area with the exception of a window zone, and the above-mentioned window zone is covered on the outside face of the sleeve by a detachable adhesive strip that is opaque to light, removal of said adhesive strip giving access to the window zone and making it possible to observe the substance present inside the container directly by eye.