A simultaneously collapsing and conveying assembly adapted to collapse constructed collapsible crates along their collapsing lines is provided herein. The collapsing assembly includes a rotating means to rotate the constructed crates by approximately 90° such as to move the open face of the crate from upward facing to forward facing and simultaneously conveying and collapsing means to convey the crates and for applying pressure on the crates' two opposing side panels, as the crates are conveyed, such as to collapse said constructed crates along their collapsing lines.