I use a 30 mounted to my Zeagles Ranger on the right side with Zeagle pony bottle mounts ( right rear weight pocket removed) mounted upright . 5 foot hose with second stage on a necklace. I put a 2 pound weight on the left upper for balance. I have tried it mounted upside down but liked the balance better upright. I have a sling kit that I built myself from a video on YouTube but did not care for the way it dived.