2. Wrap the book with paper and measure the size of the paper. The length and width of the paper are all more than five centimeters of the book.
3. completely wrap the schoolbag with paper, so that the sizes of all parts are equal;
4. Cut off the paper parts at both ends of the spine that are longer than the spine, so that the paper just completely covers the spine and can be folded inward along the four horizontal edges of the book;
5. Fold the paper inward along the horizontal or vertical edges of the book, with four horizontal edges and two vertical edges;
6. Fold all four corners of the book cover inward along the edge of the book to form an isosceles right-angled triangle, and one side of the triangle should coincide with the edge of the book;
7. Fold the paper inward along the sides of the four triangles, and the book cover completely covers the bag;
8. After binding, you'd better put the book under the mattress and press it at night. When you take it out the next day, it will be very flat and beautiful.