PolyZip Envelope features a zip closure that quickly and easily slides open and close. The unique PolyZip design protects your materials from the elements, forming a dust-resistant and water-resistant seal unmatched by traditional paper and poly envelopes. The clear front pocket allows for a separate area to secure a cover sheet or routing slip in a portrait format. Ideal for carrying letter-size documents, reports, presentations and catalogs. Perfect for storing and organizing as well. Envelope is acid-free and archival-safe.