Etekcity 200 7.5 X 10.5 Premium Self-Sealing Poly Mailers Mailing Shipping Envelope Bags Pack of 200 7.5" x 10.5" 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!