How to make a flat rectangular origami box

(page 2)

1st picture of flat rectangular origami paper box

01.

Let us have the backside of the paper facing up.

Prepare to apply a horizontal "Z-fold" and then unfold.

2nd picture of flat rectangular origami paper box

02.

Apply the horizontal "Z-fold" of the step #1 and then unfold.

Prepare to apply two horizontal "valley-folds" .

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