Grey Mailing Bags, Co-extruded with 3 layers of polythene film, our bags are manufactured from 100% recycled material providing an extremely durable and robust bag to ensure your parcel reaches the buyer in top condition. We guarantee we have unbeatable prices in the UK. Material: Low-Density Polyethylene (LDPE) Material Composition : 100% Recycle Recommended Storage Temperature: 13-21°C (55.4°F – 69.8°F) for optimum performance. Extremely lightweight allowing you to minimise postal costs. Produced using co-extrusion technology and manufactured from 50-60 microns thickness (220 -240 gauge). Compresses 3 layers of polythene film into one making them very robust, opaque and durable. 100% moisture resistant.