T05P Poly Sure Opaque Poly Mailers measure 300mm x 350mm. They’re made from co-extruded 45 micron polythene making them extremely lightweight and strong. The poly mailers are completely recyclable and biodegradable, with all print on the outer in environmentally-friendly water based ink. They are waterproof, tear and puncture resistant, helping to reduce returns caused by damage in transit. Heat sealed edges and high tack adhesive peal and stick seals provide tamper evidence and keep items confidential and protected.