Etekcity 100 6x9 Poly Mailers Shipping Envelopes Bags Self-Sealing Shipping Supplies Pack of 100 6" x 9" poly mailing envelopes with water, tear and puncture resistant High-efficiency mailers are perfect for shipping a wide variety of non-fragile items The silver inner layer provides confidentiality Pressure sensitive adhesive provides a high strength durable closure, water and dirt resistant Thick poly material, durable yet with lightweight, saved you a bunch on shipping cost!