Personally, in a city like Toronto, I would transport my gun in a modded guitar case (locked, of course). That would attract no attention whatsoever. Whether or not your gun case is locked, you can bet the second you step on the bus / subway, you're going to be attracting a lot of attention by what you're carrying. It could also make you a target of any thugs that would be interested in accquiring whatever is in your gun case. I think a guitar case would attract a lot less attention.