I had a fabulous messenger bag from the dollar store that lasted quite a few years. One of the seams finally gave out, and I was sad. So I carefully took out the rest of the seams, and used the bag to make a pattern for myself.
I have yet to cut out any pieces to sew anything together. Mostly because before I can do any sewing, I have to uncover my sewing table. At the moment, it's buried under a mountain of other projects and yarn. ::Sigh::
I swear I'm going to break the family clutter curse!!