I installed the Givi topcase (smaller one, not sure of dimensions at a moments notice), but didn't lose any parts in the process and it works great. Not cheap, but worth every penny for me. So when the topcase is off, I have lots of rails to attach bungees/nets to. Took me maybe 30 minutes to install (it was hot as heck in Texas and there was sweat in my eyes to slow me down). I'll do corresponding hard side bags eventually because I'm so pleased with the quality and also want to get my 919 to as close to sport tourer as I can. No matter what, though, it will always be a great naked bike with luggage attached. The ultimate sport tourers are great, but will also cost you more than what we can hatch together on the inexpensive and bulletproof 919.