I own a 2017 Z650 ABS (White). I installed a Vagabond Fender Eliminator and I'm now looking for a rear luggage rack to install for when I need to haul stuff. I do have a soft Chase Harper tailbag that's great, but I'd rather be securing it to a rack instead of the pillion seat. I'm unsure if I should get a hard topcase to store my helmet too. For now, I secure my helmet to the bike with a cable lock, but it's kind of a pain in the ass and it seems faster to toss the helmet in a topcase.
I've attached a pic of my bike as well