One of the seams in my everyday handbag ripped open after many years. Shoving my laptop into my bag on that side is probably what made the seam finally wear out.
The process is nice and simple. Open up an edge seam, clean up the worn out seam, and pin it together.
Finally, stitch in a three layer seam this time.
Close up the edge seam, and this should be done for another few years.