Pink Poly Mailers 10x13 Set of 30 Shipping Bags Set of 30 10x13 poly mailers. Durable self-sealing poly mailers with a strong adhesive strip. Lightweight, waterproof, and great for shipping clothing, t-shirts, accessories, crafts, and other non-fragile items. 30 mailers included. Size: 10 x 13 inches. I ship every business day. #polymailers #shippingbags #smallbusiness #reseller #mailers