Cost Efficient Quality Mailers with Dual co-extruded polythene film with inner grey and outer white. This durable courier bag provides a completely opaque covering for privacy and professional appearance. Poly Mailer / Courier Bag are self-sealing & virgin PE material with a high strength, pressure sensitive adhesive that provides secure closure. It is a fine solution for shipping a wide variety of non-fragile items and allow shipping labels adhere securely to the outer bag. Convenience for shipment preparation time combines with the lightest poly mailers & will help the cost saving as well.