Durable poly is tear- and moisture-resistant. Envelope provides superior document protection. Envelopes expand to 1-inch. Horizontal, file-style orientation makes it easy to insert and remove contents. • Durable poly is tear- and moisture-resistant. • Zipper closure. • Top loading. • 1" expansion. Durable poly is tear- and moisture-resistant. Envelope provides superior document protection. Envelopes expand to 1-inch. Horizontal, file-style orientation makes it easy to insert and remove contents. Seam Type: Weld; Trade Size: #90; Security Tinted: No; Opening: Open Side.