Here are instructions for a simple leather purse. No sewing is required, just some leather cutting (which is easiest if you have access to a laser cutter) and some lacing.
The purse is about 9" x 9" x 3" when finished.
Materials required (all are available at Tandy Leather) 1) leather (I used a large scrap of vegetable tanned leather): $20 2) lacing (I bought a 35 yard roll of lacing, but only about 3 yards were needed for the purse): $35 3) a lacing needle ($5-$10) 4) a razor (for cutting lacing) 5) a laser cutter (if you don't want to cut the leather by hand)
Attached are four files with the specific pattern I used: 1) a .dwg file (autocad file) at full scale (inches) 2) a .dxf file at full scale (inches 3) a 1/4 scale pdf with a few dimensions 4) a 1/4 scale pdf with no dimensions