We fold the letter from paper, origami still calls an envelope.
Let’s take the album sheet of paper.
1. Fold two folds “valley”.
2. Fold “valley”.
3. Fold back strip along the marked line.
4. Tuck the top corner of a strip.
5. Fold “valley” two folds.
6. Turn away right and left on the specified line.
7. Put corners into the pockets of the right and left.
8. Origami Letter is ready.