Don't know if this has been suggested before, but how about making a version of the large packing cube as a convertible backpack? I sometimes put a light (Rick Steves) microfiber backpack into my beloved Aeronaut. It would be neater if I could just zip out or loosen a pair of light but strong straps from the large packing cube and carry it that way when I needed to.
Also, sometimes on overnight trips when I don't need a bag as big as the aeronaut, I'll just take the large packing cube and it would be handy if this had backpack-style straps; currently I have to carry it by the finger loop. It should be solid dyneema sans mesh. Perhaps with a zippered compartment along the outside with a zipper like the convertible packing cube. Maybe with the means to secure this zipper shut to a loop on the side of the bag since someone walking behind could easily unzip it. And an internal loop for keys. Watcha think?
Thanks for making my favorite bags!