i am thinking of getting the aeronaut and its packing cubes. i would like to know if it's overkill to buy three or even four large packing cubes to fill up the huge space of the aeronaut. maybe you guys have better suggestions for what cubes to get to fill up the space of the aeronaut. [ the huge middle compartment.] i understand that there are the three cubes for the aeronaut bag : the small, the large and the end.