I dug up some photos that might help you find the right setup. If you go to Dan Carr's Blog
http://theskiphotographer.com/ , there are quite a few more pics that might help you out.
At 5.3 x 5.3 x 11.9", your Panny should fit into a Large Pro ICU and still have space for more gear.
Email me at sinh@fstopgear.com if you have any questions. Cheers!