I have one on the GRiSO, Norge, and Stornello.
I really like them comma but.
my experience is also only with the smallest of the Givi tank bags.
On Norge and GRiSO, no concerns.
But if you are planning to get one for the Stornello, too, I encountered some issues in installing that drove me near nuts. Or at least nuttier than I was before.
I posted a thread about this somewhere, but it might be easier if you just give me a call so I can explain before you decide to execute at least on the Stornello.