Anyone recommend s a top case for the 13' OEM rear Carrier?

[Gone in 60]

+1 for a Givi Monokey plate.

If you purchase the E251 Universal Mounting Plate, it comes with brackets that can be configured to fit any type of rack. I love their setup, since I can just unclick the box when I get to work and carry it in like a briefcase. I've got a few boxes depending on what I need to carry, so I'm not lugging around a big case when I'm just taking lunch to work.

I've got the Givi brand rack, only because I couldn't find a Honda rack when I bought my bike and didn't want to hunt for one.

**Hard to tell from the photos, but the box on the right is my "small" one, an E36, which is very low-key, and doesn't feature Givi's signature fake "taillights" that don't really serve any function. They're not even reflectors. The box on the left is the "big" one, a V47, which is larger and can hold enough for a multi-day ride. I've added some subtle touches - the V47 features Scotchlite reflective tape under the red lenses so they are actual reflectors now. The E36 has a band of black Scotchlite tape around the circumfrence. I also added a narrow LED brake light strip to the back of the E251 plate. Not visible until it lights up.