Abstract: A collapsible container assembly includes a box that may be positioned in a bed of a vehicle. The box stores objects. A plurality of tabs is provided and each of the tabs is coupled to the box. Each of the tabs is tied to the vehicle thereby facilitating the box to be retained in the bed of the vehicle. A frame is positioned within the box. The frame is foldable such that the frame is selectively positioned between a deployed position and a folded position. The frame retains the box in a cubic shape when the frame is in the deployed position. The box is collapsed when the frame is positioned in the folded position.