5000 6x9 POLY MAILERS ENVELOPES BAGS 6 x 9 By ValueMailers 2.5 MIL High Quality Self Sealing Mailers Water, Tear and Puncture resistant The PRIVATE 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