Collapsible crate with retractable wall

A collapsible container comprising:

• a base;
• a pair of opposed first walls pivotably connected to opposed first edges of the base and movable between an upright position and a collapsed position, wherein each of the first walls is in a first plane perpendicular to the base when in the upright position, wherein each of the first planes contains one of the first edges of the base;
• and
• a second wall pivotably connected to a second edge of the base and movable between an upright position and a collapsed position, wherein the second wall is perpendicular to the first walls when the second wall and the first walls are in the upright position, wherein the second wall includes a frame including a pair of elongated vertical upstanding members extending upward from a lower bar, wherein each of the upstanding members is in one of the first planes when the first walls and the second wall are in the upright position, the second wall further including a door pivotably connected to the upstanding members.