Two Bags only use one though. It is a Modified Vertex Angler Backpack.
https://www.dgcoursereview.com/forums/showpost.php?p=3307023&postcount=21 Main bag at about $82 with modifications.
The other is a 2007 tournament Discraft bag with Outcast fishing backpack straps added to the bag and a soft stroller bottle holder semi-permanently pined on to the bag with safety pins. It was a full year before they came out with the backpack otherwise I would be using that as my bag with a clipped on Innova stool, the X style one for the old sling style setup but in a way to not interfere with the straps of the backpack. Oh and a second bottle holder semi-permanently attached to the bag with safety pins.