How to make a narrow deep origami box

(page 5)

7th picture of narrow deep origami paper box

07.

Turn the origami box model over.

Prepare to apply a horizontal valley-fold and then unfold.

8th picture of narrow deep origami paper box

08.

Apply the horizontal valley-fold of the step #7 and then unfold.

Prepare to apply two valley-folds only on the front-most layer.