Durable Poly Mailers: waterproof, tear-resistant shipping bags protect small items and apparel securely during transit; perfect for everyday business use (1000-pack). Secure Self-Sealing Closure: These poly mailer envelopes feature a strong peel-and-seal adhesive strip, ensuring packages remain tamper-proof without additional tape. Cost-Effective Lightweight Packaging: Bulk 1000-count lightweight plastic shipping bags reduce postage costs, ideal for small businesses, online sellers, and retail operations. Professional Appearance: Vibrant white envelope mailers offer a clean, attractive presentation, enhancing your brand identity while maintaining customer privacy. Multipurpose large Shipping Bags: Sized 14.5"x19", these mailer envelopes conveniently ship clothing, jewelry, cosmetics, accessories, and other small e-commerce products. 14.5x19 Polymailers, 1000pcs/pack, WHITE(Silver inside), 5.5