LLS White Self-Sealing Poly Mailers Bags for Non Fragile Products Heavy-duty weather, tear, water, dirt and puncture resistant Poly Mailer PE Envelopes. Quick and pressure sensitive seal adhesive strip to close the envelope quickly and securely. Black inside color to keep the contents inside the mailer invisible for privacy. These Poly Mailers are thicker than many other products in the market and are used by many Sellers to ship their products to millions of customers daily. Try it and we will guarantee that you will like our products and come back for more to meet your frequest shipping needs!