I use the elastic harness. I'm not sure where the original video is, but this shows basically what it looks like and how to put it on.
I like it a lot. I use a thicker (about 1 inch) band for the waist and a smaller (about 1 cm) band for the one that goes between my legs. I don't even notice it when I've got it on, and it keeps my packer in place very well. I haven't had any incidents with it.