I went through this finding a sleeve-case for the 13 that could accommodate the ethernet adapter being in at all times. I ordered two of the same thing in different colors to make sure I wasn’t crazy, and the black A13 was smaller than the gray A13.
Looks like its time to abuse Prime again to see what color/model can hold a FW16 + 7700s + Ethernet, there’s enough gravity in this thing I don’t like it “loose” in my backpack.