Step 1:
I used 10 white printer- / copy papers of about 20x30 centimeters.
Prefold in half two times.
Then cut along the prefolded lines.

Step 6:
Weave a short strip through the model, see arrows (front, back, front, back etc.).

Step 5:
Glue a second long strip to the backside.
Glue the third to the front etc.
Glue 12 long strips to the shorter one.

Step 2:
Fold each paper over these two lines.

Step 4:
Make 18 strips of 30 cm and 13 long strips of 45 cm. One long strip is for the handle.
Glue a long strip to the front of a short strip, see arrow.

Step 3:
Prefold and cut a strip in half and glue/tape one half to another strip.

Step 10:
Cut off all loose parts. On the right remains a short part of these loose ends, see next picture.
Prefold over the dotted line, use the squares pattern as guidance.

Step 8:
Weave to the left and glue/tape it to the model.

Step 9:
Repeat steps 6 to 8 with all the other short strips.

Step 7:
Weave the strip all the way to the left and glue/tape it to the model.
Weave another strip through the model, start on the backside now, see arrows on the top right.

Step 16:
Repeat step 15 on three more spots

Step 15:
Fold this spot downwards, use the squares pattern as guidance.
The pink line is prefolded in step 10.

Step 12:
Fold these three edges to the right. Then glue / tape the edges to the model.

Step 11:
Prefold over the centerline, then over the two outer lines.
Use the squares pattern and purple bar as guidance.

Step 14:
Glue / tape both ends together

Step 13:
Fold over these two lines, use the squares pattern as guidance.

Step 17:
Make a sharp folding line at the bottom.