A collapsible container includes a main frame and at least one pivotable side wall that is pivotable between a collapsed position and an opened position. The pivotable side wall is provided with a spring lock insert secured therein and biased toward a lock position in which a lock portion of the spring lock insert extends beyond an end edge of the pivotable side wall. The main frame includes a latch opening that receives the spring lock insert when the pivotable side wall is in the opened position.