About this product: Made of extremely durable polypropylene material (PP) (non-toxic, non-radioactive), it is waterproof and tear-resistant, not easy to crack or deform, and can withstand repeated wear. It has 13 expandable pockets that help you easily classify and organize documents. The vertical design makes it easy to put in and take things out of your backpack. High-quality material: This accordion folder is made of PP material, which is waterproof and durable enough to keep your documents safe. With reinforced and waterproof fabric sides, the file organizer is less susceptible to breakage and collisions. Practical and compact file folder organizer, perfect for use in offices, schools, classrooms and homes. The foldable and expandable document organizer is also a great gift for your colleagues, friends, classmates, family members or business partners.