Generally I'm only going from home to wherever I'm shooting (normally my cousin's farm) so I'm really not worried about traveling incognito.
CW
I know how stupid this may sound but, as far as incognito cases go, how cool would it be if someone manufactured a case like the one Antonio Banderas had in "Desperado". It was a guitar case with what looked like a real guitar inside, then the "guitar" popped up to reveal the goodies inside. That would keep the nosy folks clueless and possibly be a hit with enthusiasts.
I use a guitar case also very discreet.