Picture Boxes 3 Sets of 40" x 60" Fold the cardboard flaps over the picture or mirror and secure in place with tape. All fragile items should be marked clearly on the boxes and kept together for packing the moving truck. UBMOVE picture boxes feature a two-piece design, making them incredibly easy to assemble and use. Simply slide your artwork or mirror into the box and adjust the pieces to fit. This design not only provides a secure fit but also makes the boxes lightweight and easy to handle.