Ok, I've wanted to do this for a while but just can't decide what I want. Bike is a 2016 R1200 GS, so it has the open cutout and exposed electronics modules when the seat is removed. Not like the pre-LC bikes. I want a small (but not too small) bag in place of the pillion seat for day/local rides. Something big enough to hold a set of rain gear or liners and a few tools, and other small essentials for day trips. Way I see it, least expensive option is to just get a bag that fits between the rails of the factory luggage rack and strap it over the open cutout, job done. But I think it would be better to have one of the pillion plates and strap or bolt (in the case of a bag with something like a tanklok ring) the bag to that. This would facilitate easier removal/replacement, as the pillion plates just remove using the key like the seat does (except for the Altrider plate, without taking a cutting wheel to it) I've also seen the lockable hard boxes that click in to the pillion seat mounting holes, and those are cool... but I don't think I could get what I wanted into one of those. And I'm keeping the factory luggage rack, which has an Altrider plate with Givi hardware on it for attaching my top case. So, let me see what solutions you all have come up with!