Yes, I rode quite a distance at night with the pack loaded as normally for work - around 13kg. My interest was in any sagging of the pack over the lamp, but it could have worked better than with a loaded T-bag. This and other Ospreys have a bow shape, so the center of gravity enters pushed in more than in other arrangements. At first I attached the pack at four points to the S-bag frame, but then I realized that just two points at the top are enough. If any problems develop over time, I can go back to the four attachment points. The beauty of the bowed Osprey frame is that the S-bag frame can stay tucked in, while carrying the backpack on one's back, without affecting in any practical way the comfort in carrying the pack.

For the moment, this works far batter than trying to turn the T-bag into a backpack. The Stratos has a zipper on the side that you orient up in the transverse orientation, so you can take stuff out and put it in, without the need to take the pack off the bike. Of course, I will be monitoring for any problems that may develop. One worry is how the Osprey's frame will hold over time in such operation.