Can I interest you in Think Tank's line of flash bags?


Lightning Flash http://www.thinktankphoto.com/produc...ning-fast.aspx


Skin Strobe http://www.thinktankphoto.com/produc...robe-case.aspx





The first one is padded and the second one isn't. According to reviews, both units could house two 580s for a very very tight fit (you'll have to remove the padding for the Lightning Flash for this to work)