I currently use this one, http://www.revzilla.com/product/dowc...nture-tank-bag
, but I've had great success with a chase harper eurosport, http://www.chaseharper.com/TankBags/...01&fr=1501.htm
& , yes, it's huge, but it works and lasted me 20 years before it started to wear out.
I used to use harro bags also, but ya cant get them no mo. Shame, they looked just right on an airhead.