BEST QUALITY 100pcs 2mil poly self sealing mailers, water resistant bags, global thank you design (6 x 9) High Quality Self Sealing Mailers. Custom Printed with "Thank You" to set your product apart and say thank you to your customers. Water, Tear and Puncture resistant 2mil poly mailer bags The inner layer of the polymailers provides confidentiality Pressure sensitive adhesive provides a high strength durable closure, water and dirt resistant High-efficiency large poly mailers are perfect for shipping a wide variety of non-fragile items.