Material: Nylon. Carries three 18" or four 16" pizza boxes. Cambro GoBags help protect the signature items that your customers love. Your recipes, your quality, and your brand are delivered to your customer, safe and sound. Quality construction with over 35 years of proven performance high-quality materials and sturdy construction are essential to protecting food quality and temperature from kitchen to customer. Cambro GoBags feature the same design as the original insulated pizza bag invented in 1983 by Ingrid Kosar, founder of Thermal Bags by Ingrid.