These 9 x 12 inch white flat Tyvek® envelopes are built from 14 lb spunbonded olefin, a material that resists puncture, tearing, and moisture at levels paper envelopes cannot match. The self-seal adhesive strip eliminates moisture activation, enabling fast closure in high-volume mailing and fulfillment environments.

The flat format suits documents, contracts, catalogs, photographs, and flexible media that must arrive undamaged and uncreased. Healthcare providers use them for records distribution, legal and financial firms for client correspondence, and e-commerce operations for flat goods requiring a professional, label-ready exterior.

Constructed from lightweight olefin, each envelope adds minimal weight to help manage postage costs without sacrificing durability through postal handling and courier delivery. Cases contain 100 envelopes and ship via parcel carrier.