How to fold an origami bar envelope

Steps

1. 1

   Step 1

   
   To make a bar envelope you need a rectangle piece of paper. A4 is a good size. Smaller rectangles can be used.
2. 2

   Step 2

   
   Place the paper with the short edges at the top and bottom Bring the bottom edge up to the top to fold in half. Bring the top layer down to the bottom crease you just made.
3. 3

   Step 3

   
   Bring the bottom edge up to its folded edge.
4. 4

   Step 4

   
   Result. Crease and unfold
5. 5

   Step 5

   
   Bring the bottom edge, of only one layer, up again to the crease you just made in the last step.
6. 6

   Step 6

   
   Fold it up one more time over its own edge
7. 7

   Step 7

   
   Fold the top edge down to the bottom edge of the flap you just made in the last step
8. 8

   Step 8

   
   Result Unfold
9. 9

   Step 9

   
   Bring the corners up and align the sides with the bottom edge of the horizontal fold
10. 10

    Step 10

    
    Fold the sides to the center along the inner edge of the triangles you just made.
11. 11

    Step 11

    
    Result. Unfold
12. 12

    Step 12

    
    Bring the top layer down only enough to make a crease from each corner point as show in the picture. (The crease is from the inner top corner to the lower outer corner of the upper most of the smallest rectangles) Unfold
13. 13

    Step 13

    
    Lift up the right side of the top layer . Press it down along the crease until you get to the top of the triangle. The triangle will pop up. Press the triangle down flat along the existing diagonal creases. Repeat on the left side
14. 14

    Step 14

    
    Fold the center back down along the crease
15. 15

    Step 15

    
    Fold the right side towards the center along the existing crease. The center crease of the triangle at the bottom will flatten along the bottom horizontal edge
16. 16

    Step 16

    
    Tuck the triangle at the bottom under along the existing diagonal crease Repeat on left side. See result next picture
17. 17

    Step 17

    
    Pull the upper left corner of the right flap down towards the center
18. 18

    Step 18

    
    Stick your finger under the diagonal edge and push the diagonal crease you made in step 12 inwards as far as it will go. The crease that was the right edge should align with the horizontal crease below it. Crease the top. Repeat on the left side. See next picture for result.
19. 19

    Step 19

    
    Fold the top down along the crease.
20. 20

    Step 20

    
    Tuck it into the bar and your envelope is done.