How to make blind bags and boxes?

The first step is to fold the square paper in half and then unfold it. Fold the crease from both sides to the middle after unfolding.

Step 2: Fold and unfold, and then fold up. The third picture is an expanded picture.

Step 3, then gently fold the crease from both sides to the middle.

Step 4: Fold and unfold, and cut the black line segment with scissors.

Step 5, stick adhesive tape on the middle two squares on the left or right side of the square paper, and then stick the left and right sides together with adhesive tape.

Step 6, after gluing, fold the four small squares above into a small triangle.

Step 7: Fold three small triangles in turn, and fold the last small triangle down into a black triangle.

Step 8: after folding, prepare another item as shown in the figure, put it in the box, and fold the other side like this.

Step 9: Finally, draw four possible projects with mechanical pencil.