Buy food in the supermarket, how the plastic bag is knotted?

1, first of all, the plastic bag ready for use, as shown in the picture.

2, and then use one hand through the plastic bag handle to pinch the other handle, as shown.

3, then the other hand to do the same operation can be, see the figure below.

4, the next cross pull can be, as shown in the figure.

5, and then repeat the above action can be, see the figure below.

6, the last plastic bag knot is completed, see the picture below.