I want to buy a pelican case for my new olympus sp350 and housing but need to know how mig the housing is (with arm). Alternatively, what pelican case would people suggest. I have been suggested one but it looks like it would be a bit small. I want to be able to fit the camera and housing and possibly a spare sp350. Maybe a lens/filter in the future. However, I want it small enough for carry-on and don't want to go ridiculous