Hi Nickj,
the Givi side cases weigh in at 5.2 kg each and the top box at 4.8 kg. What I like about them is that they are water and dust proof and best of all, everything (including the SW mounting brackets) can be removed in under a minute (if you have the keys) :woohoo:
The cases are particularly great when you go away for longer trips where you can simply remove them and carry them like a suitcase when you get to stay in civilization (like a hotel or motel for instance).
I also like that I can lock rider and pillion riding gear in it if we get to go exploring by foot on shorter trips (and the chief helmet tapper also likes that she can add shopping trinkets obtained from these on foot explorations).
I am looking forward to catching up with you and TB at some stage 
Cheers, TT