Ideal 9 x 12 Inch Size: Perfect for mailing t-shirts, apparel, documents, soft goods, and non-fragile items for e-commerce and business use. Strong Self-Seal Adhesive Closure: High-strength peel-and-seal strip ensures a secure, tamper-resistant seal without the need for tape. Waterproof & Tear-Resistant Poly Material: Protects shipments from moisture, dirt, and tearing during transit. Lightweight & Cost-Effective Mailing: Reduces mailing weight compared to boxes, helping lower postage and fulfillment costs. Bulk 5000-Pack for High-Volume Mailing: Ideal for online sellers, warehouses, offices, fulfillment centers, and small businesses. Simplify your mail process with iMBAPrice 9x12 Inch White Poly Mailers. Designed for durability and efficiency, these bulk mailing envelopes are ideal for mailing clothing, apparel, documents, and other non-fragile items. Made from waterproof, tear-resistant poly material, these mailers help protect contents from moisture and handling damage. The strong self-seal adhesive strip allows for quick, hassle-free packing with a clean, professional appearance—no tape required. With a high-value 5000-pack, these poly mailers are perfect for businesses that ship at scale, including e-commerce sellers, retail operations, and fulfillment centers.