I have the Nelson Rigg CL-200 for my Gen II (06) FJR and have found it fits ideally on the passenger seat with no problems. I've used it to haul gear for several trips and have found that in addition to being readily accessible, the rain cover (which it's supplied with) does a wonderful job of keeping everything dry on the inside even when it's pouring buckets outside. If you need an expandable pack for the occasional weekend trip, I highly recommend it. It stays on quite well and with a little ingenuity you can make straps that go under the passenger seat and hold it in place even at ballistic speeds. If you'd like pictures, I'll see if I can figure out how to post them...