Surface patterned flange for packing container

A container apparatus, comprising:

• a base section including:
• a base surface;
• base sidewalls extending upward from the base surface to define a base container portion having an upper base periphery that is opposite the base surface;
• and
• a base flange having an upper base flange surface and lower base flange surface opposite the upper base flange surface and projecting outward from the upper base periphery and including on at least one of the upper base flange surface or lower base flange surface a base relief pattern that imparts rigidity in the base flange to resist flexure of the base flange;
• a lid section, including:
• a lid surface;
• lid sidewalls extending downward from the lid surface to define a lid container portion having a lower lid periphery that is opposite the lid surface;
• and
• a lid flange having an upper lid flange surface and lower lid flange surface opposite the upper lid flange surface and projecting outward from the lower lid periphery and including on at least one of the upper lid flange surface or lower lid flange surface a lid relief pattern that imparts rigidity in the lid flange to resist flexure of the lid flange;
• wherein:
• when the container apparatus is in a closed position, the lower lid flange surface is in contact with the upper base flange surface;
• and
• the base relief pattern and the lid relief pattern are positions respect to each other such that at a particular cross section location, the contours of the relief patterns are opposite so that when a rise that occurs in the base relief pattern relative to the upper base flange surface, a lowering occurs in the lid relief pattern relative to the lower lid flange surface.