I'm not sure I have an answer but your audio capture device got me thinking about headphone amps again, and I really don't need to look at those right now.
It would be hard to suggest something for this setup because of all the different shapes of the objects. The worst is probably the mic. With a collection of items like this you almost have to think that a briefcase with egg crate style foam padding would be best since it would hold everything in place and protect at the same time.
I was going to suggest a brain cell but you already have the soft cell. I have a new work laptop and it's smaller than my last one so my brain cell has a gap now. I may switch to a smaller brain cell but I think that gap can be used to store other items like a mouse or cords. Having a gap like that could be useful. The nice thing being it's all in one package.
Have you considered (
Domke Lens wraps) and just your usual bag? I have a few of these and use them for my lenses but I would imagine they can do just about anything. With the item wrapped you can just drop it in something like an Imago and have no worries I would think.