Sag-resistant containers and blanks for making the same

A method for forming a container from a blank, the blank including a bottom panel, two opposing end panels each extending from an end edge of the bottom panel, two opposing side panels each extending from a side edge of the bottom panel, an upper reinforcing assembly at least partially extending from each end panel, and a side reinforcing assembly extending from opposing side edge of each end panel, the method comprising:

• rotating each end panel inwardly into a substantially perpendicular relationship with the bottom panel;
• rotating each side panel into a substantially perpendicular relationship with the bottom panel;
• rotating the side reinforcing assembly into a substantially perpendicular relationship with one of the two end panels;
• rotating the upper reinforcing assembly into a substantially perpendicular relationship with one of the two end panels;
• securing the side reinforcing assembly and the upper reinforcing assembly to at least one of the two side panels to form the container;
• wherein the side reinforcing assembly further includes an outer reinforcing panel and an inner reinforcing panel, said method further comprising rotating the inner reinforcing panel toward an interior surface of the outer reinforcing panel, said rotating aligning the inner reinforcing panel and the outer reinforcing panel in a substantially face-to-face relationship;
• wherein the upper reinforcing assembly further includes a top end flap and a top side flap, said method further comprising rotating the top side flap into a substantially perpendicular relationship with the top end flap, said top end flap forming a top wall in a formed container that is substantially perpendicular to said one of the two end panels.