I'm a SM and BM diver myself, but was more curious to whether slinging a single on the side of the Hollis works. Mostly use a Razor myself but initially used the Dive Rite Nomad or whatever it was called. Just don't know anyone using the Hollis to ask. I've just found in open water I prefer using a single tank on the Razor, but obviously twin for cave. Basically after some thoughts from a Hollis owner
