Strong side loading box mailers are constructed of.028 white chipboard. The protective chipboard protects photos and other documents without a need for additional stiffeners. The light-weight mailers feature side load, peel and seal, or locking tab closure, and a pull tab tear strip for easy opening. Similar to boxes used by popular shipping companies, these carton mailers are made of 200#/ECT-32-C corrugated and sold in case quantities. Side loading mailers are offered in many sizes, from 9 ¼"x3"x6 ¾" to 12 ½" x 3" x 17 ½".