Too late for me, I already ordered a small fannypack with leash on it for my wandering toddler. Today, while researching packs for my older kids, I found the following link. Evidently, the mother's fanny pack is connected to the child's, and I thought "what a great idea!
http://www.babiesinthehood.com/accessories_opair.html
http://www.babiesinthehood.com/accessories_opair.html