|The above link is my idea of how a purse is made from a zipper.
When I read the previous tip yesterday, I was stumped as to how this is possible. I went to google it, as I'm sure many people here did, and found zip [pun intended, hehe].
Then my brain finally kicked into gear, and the lightbulb lit above my head!
I hope my drawing and instructions help others understand how this bag is made :)
Edited to add: the part about the last few inches of the zipper isn't stated correctly. The zipper should be sewn all the way to the beginning of the zipper in the manner shown. The bag will be open at the top. Then sew the other side of the zipper tape to the other side of the bag [you'll have another U-turn like at the bottom of the bag]. This will close the top of the bag.
Edit #2...added a second image to the link above, to show a shoulder strap bag.