How to seal Muji pillowcases?

1. First, pull out the closed end of the pillowcase so that the back faces the open side. Grasp the middle seam with your palm, as shown in the figure below.

Secondly, don't let go, pull the pillowcase back and put it on your arm. Now the pillowcase should face outwards, as shown in the figure below.

3. Then, grab a corner of the pillow with the hand that grabs the seam of the pillowcase. Now, the middle seam of the pillowcase and the corner of the pillow should be in the same hand. As shown in the figure below.

Finally, put the pillowcase on the pillow. As shown in the figure below, keep pulling and leveling the winger.