What you need to prepare: watercolor pens, canvas bag, paper, iron.

1. First draw the desired pattern on the paper, as shown in the picture.

2. After you finish writing, immediately turn the paper upside down on the canvas bag and iron it with a powered iron. You need to pay attention to the temperature not being too high and the tabletop to be flat.

3. Next, gently open a part of the paper and observe whether it is printed. If it feels successful, just open the paper.

4. Finally, you can print the pattern on the canvas bag, as shown in the picture below.