Mystery box

[Thumpermon]

While at Bloomsburg in July, for the BMWMOA Rally, I noticed a number of GS's with a small rear case. I believe the case replaced the passenger seat, and was perhaps three or four inches high, so that it was even with the top of the rack. I have been Googling most every think I can think of, and have yet to find it online. Does anyone out there know the identity of this elusive rascal?
Thanks

[t6pilot]

Have seen what you are looking for in the BMW ON mag do not have a copy in front of me believe starting price is $299 for basic black. Check some issue of it

[bigmadstu]

Could be a tailgunner case :- THE TAILGUNNER BMW TOP CASE TAIL BAG R1200GS BMW MOTORCYCLE LUGGAGE | eBay

[Thumpermon]

Thanks, Guys

I went back through the last couple issues of BMWMOA, and found it. The vendor is GSessories.com.