From Merchant & Mills:
The Costermonger is the essential market tote designed as a backpack. Fill it up with wholesome goodies, leaving your hands free to tickle your dog. This is a simple satisfying sew that uses little fabric so ideal for using up some of your stash or making as a present. The instructions show you how to make it with leather or webbing.
Recommended Fabrics: Oilskin, Dry Oilskin, Mid-Heavy weight Cotton Canvas or Drill, Mid weight Denim (8-14oz)
Finished measurements: Length 45cm, Width 40cm