Bayard Packaging manufacture these blue polythene mailers, also referred to as mailing bags and parcel sacks from our manufacturing facility in the UK. These metallic blue mailing bags are the most popular range of all the parcel bags we manufacture, and because of the high demand from our clients for these blue mailing bags, we are able to pass on great prices to you, which make these our best value for money range. These mailing bags a produced from a virgin grade PE material but are still 100% recyclable. All our metallic blue mailing bags and parcel bags come with a self-seal closure and are made from a fully opaque 55 micron co-extruded multi-layer metallic blue PE material, ensuring they are high in strength whilst still offering a low posting weight. The blue mailers are weather-proof, burst and puncture resistant and we carry 9 sizes of these parcel sacks in stock. All of our metallic blue parcel bags are 100% recyclable and are manufactured in the UK by us at Bayard Packaging Ltd.