Check the listing for details. PREMIUM Poly Mailers – 2 Mil Thick Self Seal Waterproof Tear Resistant Envelopes. Condition: New. Listed at 9.95 USD. The PREMIUM Poly Mailers are durable self-seal envelopes designed for waterproof and tear-resistant use. These poly mailers are perfect for shipping and handling materials in a business or industrial setting. With their premium construction, they provide reliable protection for your valuable items during transportation. Ideal for those looking for a secure and efficient mailing solution, these poly mailers offer peace of mind for your shipping needs.The PREMIUM Poly Mailers are durable self-seal envelopes designed for waterproof and tear-resistant use. These poly mailers are perfect for shipping and handling materials in a business or industrial setting. With their premium construction, they provide reliable protection for your valuable items during transportation. Ideal for those looking for a secure and efficient mailing solution, these poly mailers offer peace of mind for your shipping needs.