Device holding box flaps open and down, and allowing for secure box stacking

A corner device for holding a first flap open and down adjacent to a box first sidewall and a second flap open and down adjacent to a box second sidewall, said corner device comprising:

• an inside wall;
• an outside wall;
• a rail connected to said inside wall and said outside wall said rail, said inside wall and said outside wall defining a cavity, said inside wall and said outside wall being divergent relative to said rail whereby said cavity is narrower adjacent to said rail and wider remote from said rail;
• and
• a rim upstanding from said rail, said rim being located at a location within a middle 10% of a span between where said inside wall and said outside wall connect to said rail,
• wherein:
• said inside wall has an inside wall height;
• said outside wall has an outside wall height;
• and
• said inside wall height is different than said outside wall height.

A corner device for holding a first flap open and down adjacent to a box first sidewall and a second flap open and down adjacent to a box second sidewall, said corner device comprising:

• an inside wall, said inside wall having an inside wall first section lying in an inside wall first section plane and an inside wall second section lying in an inside wall second section plane;
• an outside wall, said outside wall having an outside wall first section lying in an outside wall first section plane and an outside wall second section lying in an outside wall second section plane;
• a rail connected to said inside wall and said outside wall, wherein said rail, said inside wall and said outside wall define a cavity;
• and
• a rim upstanding from said rail,
• wherein:
• said inside wall is generally perpendicular to said rail;
• said outside wall first section plane and said inside wall first section plane are oriented divergent to each other relative to said rail wherein said cavity is narrower near said rail and wider remote from said rail;
• and
• said rim is located at a location within a middle 10% of a span between where said inside wall and said outside wall connect to said rail.