The GenWare Polyester Insulated Food Delivery Backpack is made from polyester with a thick inner insulation material to help keep food warmer from the longer. The polyester material is extremely hard wearing, durable and easy to clean. The Backpacks interior uses hot press technology to ensure the bag is leak resistant. In addition the backpack features heavy duty straps and a clear ticket pouch. This is an ideal product for the food delivery guys using bicycles.