United States Post Office Fold-Over Flap Shipping Boxes, 12-1/4in x 3in x 17-5/8in, White/Blue/Red, Pack Of 20 Boxes

When you need to ship flat or thin items, such as books, reach for this United States Post Office Fold Over Flap Shipping Box. The boxs corrugated cardboard construction is built to withstand rough handling, so your items remain safe. Ideal for shipping books and other flat or thin items. Made of corrugated cardboard to withstand rough handling. Boasts an edge crush test (ECT) rating of 26. Tested to support a weight capacity of 150 lb per square inch.