Heavy-duty side loading moving boxes, 18"L x 6"W x 45"H, Kraft (Pack of 5). these heavy-duty boxes open along the ends for easy insertion of frames, mirrors and other flat products. These are designed with full overlap (FOL) flaps for added protection and are recommended for packing flat or narrow products. Manufactured from heavy-duty 275#/ect-44 Kraft corrugated. Boxes are sold in bundle quantities and ship flat to save on storage space and shipping. 5 boxes per bundle.