N. F. String's original design is now the industry standard. We use only 200# test corrugated while others use 125# or 150#. The box has interlocking tab seal ends and tops that provide superior pilferproof design. In addition, our exclusive "see through hole" system assures a full box before you break the seal. It stacks and packs better than cloth bags. The labor handling cost savings are significant. Couple those reductions with your savings from losses and the price is a superior value. Boxes are color code printed on kraft paper. Shipped 50/bundle.