Quality Park Dupont Tyvek Grip-Seal Expansion Envelopes, Open Side, 18 Lb, First Class, 10in x 13in x 1 1/2in, Self-Adhesive, White, Box Of 100

Strong material wonT rip, tear or puncture Expand to allow for easy insertion of bulky items like books, binders, catalogs, etc. Lightweight to help you save on postage - try these instead of a heavy box or carton. Made from lightweight Tyvek material. Grip-Seal closure secures contents inside. Available in Open End or Open Side. Open End means the opening is on the smaller side of the envelope. Open Side means that the opening is on the longer side of the envelope - for an even larger opening.