Canvas. This product is more wear and soft,light that you can carry it with ease; It's also anti-aging and not easy to moldy. In addition it has good ventilation and long service life. Art portfolio case suitable for artists, students, beginners or amateurs, or as a gift to who like sketching or drawing, they will like this gift. Use durable waterproof layer, which means rain or nature will not stop you, and will not damage the contents of the bag. You can safely take the drawing board bag to any outdoor environment. This is a perfect artist backpack that can satisfy your basic needs of carrying art supplies,good choice for artists,students,children,amateurs,,hobbyist,teachers.