Cartons are sold in bundle quantities and ship flat to save on storage space and shipping. Overall Dimensions: 18. 5" 18. 5" 9". 32 ECT. These cartons are the industry standard. Sold as a 20/Bundle. Strong, durable corrugated fiberboard. 200#/ECT-32 (Edge Crush Test) - holds up to 65 lbs. Meets most mailing and shipping carrier specifications. Staples brand 100% satisfaction guaranteed. Corrugated Boxes are manufactured from 200#/ECT 32corrugated. Corrugated Shipping Box is an industrial corrugated box that offers quality, standard, and strength.