Most of the time, my Rat sits in my backpacket along with a water bottle, often with spare socks. It could be put into a slightly more upscale backpack/back-breifcase, or into a double sided laptop case. If you were looking for something a little smaller, the smaller organizers that SpecOps and others make would be fine for concealing a PSK.

And I wouldn't use camo- black goes with everything.