Package material blank and method of forming the same

Package material blank comprising a multilayer material structure having a layer of cellulosic material and one or more layers of plastic laminate, the package material blank comprising:

• a body panel having a main panel, two side panels arranged on different sides adjacent to the main panel, and at least one third panel arranged adjacent to one of the side panels;
• end closure panels arranged adjacent to the body panel, the end closure panels comprising a top closure panel and a bottom closure panel arranged adjacent to the main panel and the at least one third panel, respectively and flap closure panels arranged adjacent to the two side panels;
• respective lines of weakness between each panel of the body panel and the end closure panels for folding the panels along said lines of weakness;
• and
• a line of weakness on the main panel having a first portion and a second portion, wherein the first portion extends from a first point to a second point and the second portion extends from a third point to the second point;
• an opening device having:
• a tab arranged on a first surface of the blank;
• an elongated opening strip arranged on a second surface opposite the first surface;
• the tab being connected to the opening strip portion via a bridge penetrating through the multilayer material structure in the weakened area;
• the opening strip being substantially parallel to the line of weakness between the main panel and the top closure panel;
• and
• a support portion arranged on the first surface of the main panel adjacent to the opening strip, wherein the support portion is closer to the line of weakness between the main panel and the bottom closure panel than the opening strip.