28 x 6 x 52 FOL Side Loading Corrugated Boxes 5/Case: Side Loading Kraft Corrugated Boxes sold in cases of 5 are designed for convenient packaging of long narrow or irregularly shaped products. These boxes open along the ends for easy insertion and their full overlap (FOL) flaps provide robust edge protection for added strength and security. Constructed from durable kraft corrugated material these boxes ship flat to save on storage space and shipping costs making them an efficient choice for bulk packaging needs.