in some embodiments the combustion plate may be hingedly joined with a hinge 110 to one of the panels of either the first or second pair and in yet a further embodiment the hinge may allow the combustion plate to pivot in an upward direction between the panels when the combustion container is being collapsed for storage in such a case the combustion plate will also fit into the relief space and the thickness of the relief space may be adjusted to accommodate the presence of the combustion plate further as shown in fig1 and 8 b in some embodiments the hinge 110 may be angled or relieved out of the plane in which the panel to which it is attached resides an advantage created by such angling is that it allows the combustion plate to rest substantially flat against the panel to which it is hinged when folded into an upright position such flat abutment reduces the amount of relief space required to allow the container 10 to be flat when in a collapsed configuration thusly the angling of the hinge effectively decreases the thickness of the device when folded into the collapsed configuration in some aspects the amount of angle of the hinge may be equal or substantially equal to a thickness of the combustion plate.