Microwave heating device (174), comprising: a first main panel (102； 202； 602) and a second main panel (104) opposite each other； a first secondary panel (106； 206； 606) and a second secondary panel (108； 208； 608； 708) opposite each other, the first secondary panel and the second secondary panel being foldably connected to the first main panel and the second main panel along the respective fold lines (110, 112, 114, 116) to define, at least partially, an interior space (180), a material (168) interactive with the microwave energy that is located on at least one part of at least one of the first main panel (102； 202； 602), the second main panel (104), the first secondary panel (106； 206； 606) and a second secondary panel (108； 208； 608； 708) on one side of the respective panel located in front of the interior space； each of the first main panel and the second main panel having a width that extends between a respective pair of said folding lines (110, 112, 114, 116), and a first end panel (136) foldably attached to the first main panel along an arched fold line (138), in which the arched fold line has a pair of end points located along the fold lines (112, 114) of the first main panel, including the first end panel a pair of opposite side edges (142, 144) extending from the end points of the arched fold line to the end points of an arched end edge (140) opposite the arched fold line； wherein the device includes a removable part (158； 258； 658) comprising at least a part of at least one of the first main panel, the second main panel, the first secondary panel and the second secondary panel, the removable part being defined, at least partially, by a transverse tearing line (160； 260； 660) which extends, at least partially, through the respective panel, an oblique tearing line (166； 266； 666b ) substantially abutting the transverse tearing line, and a cutout (152； 252； 652； 752) close to the oblique tearing line, characterized in that the first and second secondary pane
