First off, we need to measure the bottom of our bag. (between the boxed corners.)
I will then fold them right sides together, and stitch ONLY the short sides. I then trim the corner and turn it right side out. Press them neatly.
I then pin the folded side of this fabric to my zipper. One piece of fabric on each side of the zipper, being sure that the ends of the fabric match up across the zipper.
The following pictures show me stitching the one piece of fabric one to the zipper. I always stitch to my zipper twice. The pictures show better then I can explain it with words.
I've got to run, but I'll try to post the next part soon!