KEMIMOTO Rear Bike Rack Bag - 8L PVC Water Resistant Ebike Bags for Bicycle Rear Rack, Bicycle Trunk Pannier for Commuter Travel Shopping and Cycling (Black)

Klipfix adapters work provided they are spaced correctly. I have one on my Vincita R&B bag. When I don't need that kind of capacity I use an inexpensive Kemimoto bag. It's slightly more work to get it on and off, but I like the price a lot better than the Brompton bag.