I had tried my best to make a simple tutorial for you..
For the BAG you will need:
2 pieces fabric 16 x 14 inches or 40.50 x 35.50 cm (outside)
2 pieces muslin fabric 16 x 14 inches or 40.50 x 35.50 cm (lining)
4 pieces interfacing fabric 16 x 14 inches or 40.50 x 35.50 cm
Stitch 1/2 inches from edge.
Leave it open for the top and both square corners.
Create a triangle at each bottom corner with the side seam centered on top.
Ah, it's difficult for me to describe this into words...
Just please see the photos below :)
This is what your outside bag should look like at this point.
For the inside POCKET you will need:
2 pieces fabric 13 x 10 inches or 33 x 25 cm. I use the same fabric as outside bag for this pocket.
Don't forget to put the interfacing fabric between layers.
For the STRAP you will need :
1 pieces 7 x 41 inches outside fabric.
1 pieces 7 x 41 inches muslin fabric for making the strap thicker but still soft to your shoulder.
Place lining fabric inside the outside fabric right sides together.







