The fabric is made of frosted polyester cloth, textured, soft and hard, classic design, large steel ring opening, large internal capacity, easy to store a4 size objects, and has a document bag and mobile phone pocket, the back side of the bag There is a zipper opening straight through the bag, which has the effect of anti-theft, and is easy to use. The front of the bag has a zipper bag, which can be used for common stuff, and the side has a pocket for a kettle and the like.