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9. Unfold the previous step.
10. Fold the bottom edge up using the top of the diagonal creases you just made as a guide.
11. Open out the bottom section, squash folding the two sides into triangles.
12. Fold the bottom edge up, just past the midway point.
13. Fold the top of the bottom section down to match the flap underneath.
14. Unfold the bottom folds.
15. Fold the left and right edges of the bag inwards, using the bottom-most crease as a guide.
16. Unfold the previous step.