How to make a 3D origami bag

(page 5)

7th picture of 3D origami bag

07.

Pull the front-most layer up.

Prepare to apply a horizontal "valley-fold" and then a horizontal "mountain-fold" .

8th picture of 3D origami bag

08.

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

Prepare to apply two vertical "valley-folds" .