How do others place Rick's packing cubes in their backpack style bags? Do you put the big cube at the bottom and the 2 smaller ones on top or vise versa? Or does it depend on the weight of the cubes?
Generally my large cube is heavier, so I put that one on the bottom.
I bought two sets, so I could use 4 "small" cubes. I found the large one way too large for the amount of stuff I want to pack! His cubes are very deep, so even the small ones have a pretty large capacity.
There really isn't any magical or correct order to pack the cubes. I generally pack in the order that I want access. If I am going to frequently access one of the cubes, then it goes on top. If it has only soft clothes like underwear it may get wedged into a corner. We tend to use smaller cubes and arrange in the best order to use the space.