What's the term for the bag that sits on top? Am very conscious of increasing my width (har har) and think that I would rather go up, then out.
A top case; why do people always say "bag"? I didn't mention top cases because you didn't (I assumed you weren't interested or had solved it already), but a top case is the best kind of storage if you want a narrow profile, waterproofing, and a lot of volume. I've gone on airline trips for several days with a bag that fills a top case. A large enough top case is like having a car trunk on your bike.
So that means I would need to get the Zero plate, which would work with... just the oem bags, unless I get those adapter plates?
Any recommendations for a good detachable top case, then? I will take a look at trax and aero.
Er, TraX and Aero were sidecase recommendations, not top cases. TraX does make a boxy top-case, but it's overkill and not very useful (doesn't fit a helmet well).
Zero sells their top case mount separately from the cases:
http://www.zeromotorcycles.com/shop/index.php?main_page=product_info&cPath=15_7&products_id=187This was not available in 2013 when I first put luggage on my bike. Honestly, I think I got the first non-fleet sales of luggage... Anyway, with that plate, you put a case adapter plate on it for Givi
Monolock (scooter-oriented cases) or
Monokey (generally larger cases, uses an
E251), or another plate type for another vendor.
Honestly, there's a lot of choices for top cases (Shad, Kappa, Hepco Becker, ...), because they all just sit on a plate with a locking mechanism. So, it's a matter of taste, capacity, and price.
Even if you don't get a case, just install the top plate and strap a waterproof bag to it using tie downs like Rok straps. Some people just bolt plastic crates to them and shove their stuff in there.