1000 14.5x19 WHITE 2.5 MIL POLY MAILER ENVELOPES BAGS 14.5 x 19 High Quality Self Sealing Mailers. Water, Tear and Puncture resistant. The silver inner layer provides confidentiality Pressure sensitive adhesive provides a high strength durable closure, water and dirt resistant High-efficiency mailers are perfect for shipping a wide variety of non-fragile items.