RE:Fanny Pack Alternative
I was unsure of the stability of it as well. When it arrived, though, I was pleased to find a waist level strap that wraps around your body. It latches in the front, just under the small chest pack, effectively locking it to your torso when you don't want it to move. I don't know if it is an add on to their original design because the bandolier in the picture definitely doesn't have one.
I'll bring it to the casting clave for people to check out.