With Mpak™ envelopes, you can send heavy and bulky objects, conveniently, using a mailer that is much stronger than conventional Kraft paper. Made out of a tough, flexible, non-paper material that is extremely lightweight. Resists water, tearing, and is 100% recyclable. Envelope Size: 14 x 20; Envelope/Mailer Type: Expansion; Closure: Flap-Stik® Self-Adhesive; Trade Size: NA. Envelope Mpak Expansion
Additional Information

Conveniently send heavy and bulky objects while saving money over conventional corrugated boxes. Tough, flexible, nonpaper material that is water-resistant and tear-resistant and 100 percent recyclable.