I found the Pilot to be a good bag, but I want a big compartment with similar outer dimensions. I felt constrained by the water bottle pocket dividing the front of the Pilot. So the Cadet seems to be my next bag.

No other items in main compartment:

Would the Cadet fit a full A45 Large packing cube (with some space on the end, maybe too thick)
Would the Cadet fit a full A30 Large packing cube? (smaller, but maybe too thick)
Would a full Western Flyer packing cube be the best fit? (appears near perfect fit)