Our tamper proof courier bags are manufactured from co-extruded polyethylene films, which are black inside and white outside. The bags’ flaps come with a hot melt adhesive strip for easy & permanent closure. These are tamper proof and cannot be opened once sealed, perfect for shipment of products Standard sizes and custom sizes both available Customised printing, colour, unique serial number/bar code available As required, bags may be made transparent or opaque Come with a transparent jacket for insertion of address