Degradable plastic. Manufactured from High Quality 50 micron degradable HDPE/LDPE blend which gives the product a paper-like feel, it's incredibly tough, and waterproof. Very neat, fully cut out oval handle. This a "most often" retail size, perfect for fashion, and strong and big enough to take, for example, a well filled lever arch file with room to spare, so its great for Promotional use for literature etc.