Pack of 50 Poly Mailers Shipping Bags Self Seal Premium Semi White 6.25" x 6.75" About Our Item: Mailers are puncture, water, tamper and tear resistant. All sizes are outer dimensions. High Strength seams will keep contents intact, even if over packed. The outer surface of the mailer is semi white, and the inner lining is silver Labels adhere well. Self-Sealing Poly mailers are polyethylene shipping bags that are waterproof, tearproof, self-sealing, and tamper-resistant. They are considered the best choice for e-commerce shipping as they are self-seal and tear-proof. You can find them in different sizes and colors, we have a huge selection. Poly mailers are also flexible, self-sealing, and ideal for shipping apparel and other non-fragile items. They are usually the most affordable way to ship soft goods like apparel, blankets, purses, and backpacks.