Made from high quality 600D polyester, durable, sturdy and strong. 4 size available, 14" x 16.5" , 17.75" x 24", 20" x 25.5" and 23" x 30.5". lightweight and waterproof, simple and practical, zipper closure keep inside clean, dry and secure. It is perfect and professional for keeping your artwork and important paper handy at home, work and school.