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Quality Park™ DuPont® MPak™ Self-Seal Mailers 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: 16 x 21; Envelope/Mailer Type: Expansion; Closure: Flap-Stik® Self-Adhesive; Trade Size: NA.
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