The seats on the 650s are bolted on. Or at least it was on my 04 650 Classic. The cover is on the left (clutch) side and you open it with the ignition key. It's pretty spacious. I kept a ball cap and gloves in there, besides the tool kit and my papers.
Check your local laws, but in many states it is required that you carry proof of insurance. If you need that, it's just as easy to carry the registration along with it.
2007 Vstar 1300 Tourer
Too many bolt-on goodies to remember!
Gone but not forgotten...
Memeber of the Black Bike Club -- Fastest Color Available!!