Gris gris, conjure hand, conjure bag, spell bag, toby, mojo hand, wanga, gree gree, they all add up to the same thing, a bag made with blessed items, stones, and herbs carried on the person to aid in aspects of life. Most believe that if another touches the charm it will loose all power for the holder, each ingredient is picked to add power to the charm, with each piece being prayed over and then added to the bag which is then prayed over as a whole. The bag is then carried on the person and *fed* with oil, spit, holy water and the like. When I was younger I made what i called spell bags something within told me that a charm made up of different herbs and stones carried on the individual would bring that person the outcome they desired, and while I was working an occult shop I would make these "spell bags" by carefully putting each ingredient into a large wooden bowl while asking each ingredient to aid my cause, then I would mix the ingredients by carefully working the bowl in a clockwise pattern praying again that the ingredients would aid my cause, I would then add the mixture to a bag chosen by color and hold the bag in my hands warming it with my energies filling it with purpose. I am not saying that this is the only way, I am saying that I did not learn to do this by any teacher, I trusted my instincts, and something from inside of me, as well as from without influencing my actions knew what to do. It wasn't until I started my journey into Voodoo and Hoodoo that I found a name for what I had been doing all along. I was surprised to find that a fair number of seemingly small things that had become part of my practices were linked in this way.
I wrote this, but I still like to site my sources