The Joe Rocket magnetic tank bag. They make 2 sizes (I have the Sport model) and would highly recommend it to anyone. Mine has about 40,000 on it. Been to Newfoundland, Montreal several times, East coast a couple (besides the Newfie trip. It's been to Louisiana, to Nashville, St Louis (OK, so you get the point).
It may be a little more than you want to spend, but it's worth it, believe me.
It may be a little more than you want to spend, but it's worth it, believe me.