Our 18 x 15 x 15-13-11 Multi-Depth boxes offer the benefits of having many box sizes in your inventory to suit your various packaging needs and save warehouse space. Box sides are scored to multiple depths to allow height adjustment for a perfect fit. Our 18'' x 15'' Multi-Depth style boxes adjust to the heights of 15", 13" and 11". These 18" x 15" shipping boxes meet requirements for 200#-C/ECT-32-C corrugated. Great for shipping or storing large size items.