ALL OF MY LEATHER GOODS ARE HAND SEWN.
This is not because I like torturing myself or because I have tons of time to waste. Hand sewing leather using a two-needle technique makes a stronger, longer lasting seam.
Here is the difference between machine sewing and hand sewing with diagrams:
Machine sewn seams use a type of stitch called a "lockstitch". This is how nearly everything in your closet is sewn together. Although this is the fastest and cheapest mode of sewing, it does not last as long as a properly sewn, hand stitched seam. When the thread breaks in one place, many stitches will pop in a row, leaving a gaping hole.