I have a Hollis SMS100 double bladder wing only (not the wing with a harness set- up). It has less than a dozen freshwater only dives. Nothing wrong with it,... just more than I need. I use the wing for my rebreather & the double bladder is too much. Wanting an SMS100 single bladder wing. I am not interested in any other style wings. Anyone with an SMS100 single bladder wing in need of a double bladder? I would like to swap.