The compressor for the Q4 is quite a bit larger then the Mini-mite, since it has additional baffling for noise reduction purposes. I also wanted to mention that I have the gravity gun version, which has a smaller paint cup on top vs. the larger cup on the bottom. I need to do take some measurements, but I am pretty sure and Systainer 4 or 5 should work. In the worst case scenario I can always get a Systainer 3 and use that for the gun and all of the accessories, and store the compressor separately.