This eco friendly backpack is made of washable kraft paper. It is a German engineered paper that were used in making jeans tags. People give it different names: washable paper, washable kraft paper, kraft paper fabric, leather paper, Kraft-Tex, etc. Basically, it is a lightweight kraft paper with high tear resistance, made of natural wooden fiber and synthetic latex. The material has been tanned during production, resulting it to be very durable and water resistance. It is recyclable and ideal for customers with eco- or vegan-conciousness.