outside fabric
Lining fabric
Sew one side
sew the zipper in: just continue along one hand sewing one side at a time
here is how the zipper should look.
on the other side you will have to sew in the ribbon to serve for the strap. i think i got a yard because it was cheap, like .33 cents a yard and i just a tie a pretty knot at the top depending on how much i need. this way i would have plenty left to leave excess and sew into the bag. it will be visible from in the lining. also be sure you don't have any twists in the ribbon its not going to be fun to fix it later.
once the straps are in place continue sewing in the second side of the zipper.
once all that is done you can sew the final side of the bag.
if you turn it inside out this if what it should look like.
the finished bag from the top down.
the finished bag!
