Package material comprising a multilayer material structure having one or more layers of plastic laminate, the package material comprising: a penetration area (5,62,250) defined in the multilayer material structure; an opening device, the opening device comprising: a first portion (3,63,220) attached to a first side of the multilayer material structure; a second portion (2,222) attached to a second side of the multilayer material structure; a material bridge (31,65,231) penetrating through the penetration area (5,62,250) and connecting the first portion (3,63,220) to the second portion (2,222); wherein the second portion (2,222) at least partly covers the penetration area (5,62,250) and comprising a rupture section (13,213), said rupture section (13,213) covering an area (12, 212) in the multilayer structure of opening the package, two weakening lines defining said area of opening in between, each of the two weakening lines extending from the penetration area or close from the penetration area, said area providing an opening in the multilayer material structure when being ruptured, characterised in that the rupture section (13, 213) comprises one or more rupture recesses (14, 141-145, 232) disposed over said area for guiding a rupture of the multilayer material structure and wherein the one or more rupture recesses (14, 141-145) are disposed over or adjacent to the weakening lines for guiding a rupture of the multilayer material structure along the weakening lines (10, 61), and the rupture section covers the weakening lines to their respective end portions. a penetration area (5,62,250) defined in the multilayer material structure; an opening device, the opening device comprising: a first portion (3,63,220) attached to a first side of the multilayer material structure; a second portion (2,222) attached to a second side of the multilayer material structure; a material bridge (31,65,231) penetrating through the penetration area (5,62,250) and connecting the first portion (3,63,220) to the second portion (2,222); wherein the second portion (2,222) at least partly covers the penetration area (5,62,250) and comprising a rupture section (13,213), said rupture section (13,213) covering an area (12, 212) in the multilayer structure of opening the package, two weakening lines defining said area of opening in between, each of the two weakening lines extending from the penetration area or close from the penetration area, said area providing an opening in the multilayer material structure when being ruptured, characterised in that the rupture section (13, 213) comprises one or more rupture recesses (14, 141-145, 232) disposed over said area for guiding a rupture of the multilayer material structure and wherein the one or more rupture recesses (14, 141-145) are disposed over or adjacent to the weakening lines for guiding a rupture of the multilayer material structure along the weakening lines (10, 61), and the rupture section covers the weakening lines to their respective end portions. a first portion (3,63,220) attached to a first side of the multilayer material structure; a second portion (2,222) attached to a second side of the multilayer material structure; a material bridge (31,65,231) penetrating through the penetration area (5,62,250) and connecting the first portion (3,63,220) to the second portion (2,222); wherein the second portion (2,222) at least partly covers the penetration area (5,62,250) and comprising a rupture section (13,213), said rupture section (13,213) covering an area (12, 212) in the multilayer structure of opening the package, two weakening lines defining said area of opening in between, each of the two weakening lines extending from the penetration area or close from the penetration area, said area providing an opening in the multilayer material structure when being ruptured, characterised in that the rupture section (13, 213) comprises one or more rupture recesses (14, 141-145, 232) disposed over said area for guiding a rupture of the multilayer material structure and wherein the one or more rupture recesses (14, 141-145) are disposed over or adjacent to the weakening lines for guiding a rupture of the multilayer material structure along the weakening lines (10, 61), and the rupture section covers the weakening lines to their respective end portions.