These cartons open along the ends for easy insertion of frames, mirrors and other flat products such as TVs etc. Designed with full overlap (F.O.L.) flaps for added protection. Double Wall (5 Ply) as the name implies, has two fluted mediums sandwiched between three sheets of brown Kraft paper. All UPack’s TV boxes are double-wall boxes and can be stacked for longer periods of time than single wall while resisting crushing and compressing. Boxes are sold in bundle quantities and ship flat to save on storage space and shipping.