A co-extruded multilayer tubular foil comprising an arrangement of identical foil blocks (26_1, 26_2) that are repeated in an axial direction of the tubular foil, each foil block comprising a welded seam that connects two opposite sides of the tubular foil thereby at least partially defining a first and second piping bag; said tubular foil comprising an outer layer, an inner layer, and an intermediate layer arranged in between the outer layer and the inner layer; wherein the outer layer and the inner layer are transparent and the intermediate layer is partially transparent through a distribution of pigment additives in the intermediate layer that is non-uniform at least in a direction perpendicular to the axial direction, wherein each foil block further comprises a transverse perforation line arranged perpendicular to said axial direction, and wherein the welded seam extends obliquely across the foil block and defines, together with edges of the tubular foil, a tip region for each of said first and second piping bag; wherein the intermediate layer comprises a first region and a second region, wherein the first region and second region are mutually connected and adjacently arranged in a direction parallel to a surface of the tubular foil; wherein the second region of the intermediate layer is transparent and wherein the first region of the intermediate layer comprises at least a part of said pigment additives to provide a colored strip that extends in the axial direction, said colored strip at least partially coloring the tip region for the first or second piping bag; the intermediate layer further comprising a further first region and a further second region, the further first region having one or more pigment additives to provide a further colored strip that extends in the axial direction, said further colored strip at least partially coloring the tip region for the other of the first or second piping bag, wherein the further second region of the intermediate layer is transparent; wherein the first region and the further first region are each arranged between the second region and the further second region; and wherein the second region and the further second region are aligned with each other to form a transparent window to provide a view through the tubular foil. said tubular foil comprising an outer layer, an inner layer, and an intermediate layer arranged in between the outer layer and the inner layer; wherein the outer layer and the inner layer are transparent and the intermediate layer is partially transparent through a distribution of pigment additives in the intermediate layer that is non-uniform at least in a direction perpendicular to the axial direction, wherein each foil block further comprises a transverse perforation line arranged perpendicular to said axial direction, and wherein the welded seam extends obliquely across the foil block and defines, together with edges of the tubular foil, a tip region for each of said first and second piping bag; wherein the intermediate layer comprises a first region and a second region, wherein the first region and second region are mutually connected and adjacently arranged in a direction parallel to a surface of the tubular foil; wherein the second region of the intermediate layer is transparent and wherein the first region of the intermediate layer comprises at least a part of said pigment additives to provide a colored strip that extends in the axial direction, said colored strip at least partially coloring the tip region for the first or second piping bag; the intermediate layer further comprising a further first region and a further second region, the further first region having one or more pigment additives to provide a further colored strip that extends in the axial direction, said further colored strip at least partially coloring the tip region for the other of the first or second piping bag, wherein the further second region of the intermediate layer is transparent; wherein the first region and the further first region are each arranged between the second region and the further second region; and wherein the second region and the further second region are aligned with each other to form a transparent window to provide a view through the tubular foil.