The case mounted via a universal plate that bolted onto the rack,with a lot of options. I mounted the universal bracket as far back as I thought safe so the passenger can actually fit in there. The case is super light and looks to be well made. The key doubles as a way to open the case or to unhook the case off the bike. The case cab easily hold a helmet, gloves, and a few other small items, or be used for grocery trips. I actually found the backrest at a dealer in Nevada that's dumping all their Hepco & Becker gear. I wouldn't pay 40.00d shipping for it. I think it was 20 and change. Today, u carried my laptop, charger, coat and a few other things back there. Worked fine. The inside of the case could use some padding, but I am OK without it. The red color on the back is not reflective from what I can see, but adds some color. So, I guess I am happy with this purchase. Having some storage on board is really nice and can be easily removed when it's not needed. I am keeping this Grom stock, although the Blue panels I have seen on someone else's bike look amazing.