Abstract: The invention concerns a sealing membrane (2) for a container (5), said membrane (2) having an edge region (4) intended to be secured around an opening (5a) of the container (5) such as to form a sealing of the container (5), the membrane (2) comprising a pull-tab (1) extending from a portion of the edge region (4) such as to facilitate simplified release of the membrane (2).The invention is characterized in 12 that the pull-tab (1) comprises a stiffening structure (7) arranged in a pattern that defines an intended folding line (3) extending across the pull-tab (1). The invention also concerns a container arrangement (8) comprising a container (5) with an opening (5a) and, at least partly secured to the container (5) around the opening (5a), a sealing membrane (2) of the above type. The invention also concerns a method of manufacturing a sealing membrane (2) of the above type, wherein the method comprises the step of embossing, corrugation, creasing, folding and/or heat shaping the stiffening structure (7).