I think I'm on topic here; if not I apologize for the threadjack.
I'll be needing a diaper bag soon (Yes, this topic again. I apologize for this as well.) and I'm pretty much decided on a Synapse plus packing cubes/stuff sacks solution. The question is: how do the various cube sizes fit in there? I should think that around 3 cubes would be good for organization purposes, and any room left over could be used for stuff sacks. I can use the measurements given on the product pages for mathematically arriving at some idea of how it would go, but I'd also appreciate the informed opinions of anyone that's been down this road before me. Maybe there's already some good info posted and I've missed it?
I have the a bit small Mountainsmith Trip with strappettes. They're designed reliable and have careful design - great company, comparison coating, glasses wallet, nice zip draws. I actually use it as a go bag but I've hiked with it too.