Thanks Kevin. I prefer your bag due to: 1) the attach points, 2) the zipper and 3) the side pockets. I only linked the picture with the custom bag to give you a better sense of the configuration I am looking to execute (credit goes to udpumpkin for finding the photo).
So I guess what you are saying is that if I go with the 4800 and fill it to 2/3 of capacity and roll down the excess I would not be able to attach the bag to the frame without modifications? Still wondering if the zipper would be accessible with the bag rolled down 1/3? Or maybe the frame extenders allows me to run in this configuration without modifications?