T15P Poly Sure Opaque Poly Mailers measure 400mm x 525mm and therefore offer plenty of room for sending items without risk of damage from wet weather and dirt. Because these market leading poly bags are made of co-extruded 45 micron polythene, they’re lightweight, strong, waterproof, puncture resistant and tear resistant, making them able to reduce postal costs and returns due to damage during transit. Made from a fully recyclable and degradable material, with all print on the outside in water-based inks; they are environmentally-friendly too. Confidentiality and security is assured by tamper proof seals, heat sealed edges and a high opacity finish – no one can see or get in undetected!