Our strong polythene mailing bags are made from co-extruded polythene. Three layers of film are extruded together to create these tough and durable mailing sacks. These offer much higher levels of strength and durability compared to standard despatch bags (made from mono layer film). For ease of closure, all of our mailing sacks have a strong self-adhesive strip. Simply peel off the strip on the lip of the bag to conveniently seal the mailing sack. Standard mailing bags can often be slightly transparent, revealing the contents. Our strong co-extruded mailing bags have a black inner layer making them 100% opaque. Ideal where confidentiality is important. Our mailing bags are ideal for the mailing and despatch industries as well as catalogue and ecommerce businesses.