It definitely helps with the trim of the cylinders. Gets them right behind the armpit and inline with your body. I don't understand why everyone thinks the ring bungees are so good for boat diving, or any diving for that matter. The trim is just horrendous no matter what way you use them, I use Edd's way myself. Clip in the tanks, then when I am in the water, I wrap the bungees around the valves. Easy.