I take this backpack / purse hiking with me all the time and its lasted much longer than any of my backpacks, so I thought I'd show you how to make one!
It's very simple, and took me less than 20 minutes to make. If you've got an old bag lying around, it might be worth the small experiment to see if it could work as your new backpack. Check out how it's done!
Step 1: Materials
A satchel / purse
A bit of extra fabric (Old belt? Old backpack strap? Piece of left over jean?)
A needle and thread
A pair of scissors
Two Fold-Back clips (smaller is better)
A candle (optional)
Step 2: The Clips
Step 3: The Strap
I then got out a candle and lit it to sear the end of the strap so it won't fray later on with frequent use. This is important for plastic fabrics, but if you're using cotton, you want to fold the ends under itself (hem it) and stitch through the folded fabric to avoid fraying. If you're using leather, you don't really have to worry about it, but that'll be a HARD stitch. :/
I then hand stitched the bottom of the strap to the bag (the bottom of the strap is the side without the clips on it).
Step 4: Stitching on the Clips
Go ahead and place the strap down on the bottom so that the new strap we are sewing on will hold it in place. Then stitch around the longer metal handle of the Flip-Clip. Make sure to knot the thread after, and then trim it off.
And you're pretty much done!
Step 5: How to Use It
And here's another gif which shows how it works altogether.
Step 6: Model Your Finished Product!
While creating this instructable, I found this really great a instructable for modifying your messenger bag with all sorts of pockets and cavities and it looks great! Check it out if you want to REALLY make your purse / messenger bag into a backpack replacement with compartments: