Patent ID: 8342347

Claim:
A collapsible container comprising: a roof; a base; two opposing end walls, each end wall comprising an upper and a lower end wall panel pivotally attached to said roof and said base respectively, said upper end wall panel being horizontally pivotally attached to said lower end wall panel to permit inward folding of each of said end walls; two opposing removable side walls fitting between said roof and said base; at least one slide lock; each slide lock riding along common lateral edges of said upper and lower end wall panels, wherein said slide lock prevents the inward folding of an end wall when in a locked position by traversing the horizontal axis about which the upper and lower end wall panels are pivotally attached to one another and allows the inward folding of an end wall when in an unlocked position by residing entirely within the upper end wall panel or entirely within the lower end wall panel; said end walls and said side walls being a twinned wall structure defined by inner and outer wall members made of plastic; wherein at least one of said side walls and said end walls has a plurality of elongated concave indentations, each concave indentation independently forming a substantially vertical internal arch between said inner and outer wall members, said arch being arcuately shaped and spanning the length of said concave indentation; whereby said container is collapsible by removing said side walls and, with each slide lock in said unlocked position, inwardly folding said end walls to draw said roof closer to said base.