I know this is an old post but ive just found the GT Moto tool tube, for earlier questions about security they now do it with a set screw locking system
http://www.gtmoto.com/images/setscrew.jpg
It is alot of money but a good looking bit of kit. I've spent alot of money on my bike and i dont want to ruin it by tie wrapping an old bit of drain pipe to it
Takes the headache away from tool storage, as theres hardly any room under the seat and mines taken up with my Star Com system