One on each hip. I dive rivers and current is the only thing to keep you off balance. I also experienced with a 5mm and a 3mm on that my 3-4-5 lbers I was wearing... all I had.. wasnt enuff.... So I need more and I believe I can get what Im needing with 20lbs start in cool and swift waters. Its nice to be neutral, but in a river its a different ball game when you want to be on the bottom.