So after a dozen or so rounds with the Rebel, I've either gotten used to the pockets or they've broken in a bit, or both. I still only keep the one Rhyno in the top pocket but 3 drivers each in the middle and bottom pockets, and they work fine. Still a little tight, especially with larger diameter mids in the bottom trough, but not a huge deal. It's a huge advantage to be able to carry so many more discs comfortably and that's really all that matters in the end.
Also I used it as my carry-on for my Mexico trip and it was awesome in that role as well. The disc pockets are great for organizing small items like toiletries, socks, etc. And while down there I took it to concerts, and it worked flawlessly to keep a bottle of wine cold for about an hour, a poster tube fit perfectly in one of the side pockets, and the Velcro umbrella/stool strap fit snugly around the tube to keep it in place. I flew home with the tube still in that pocket, and it worked out great.
Overall really happy with this bag!