Before I go and reinvent the wheel, I was wondering... Has anyone worked on a safety strap or a retainer "just in case" for the BMW Vario side cases. I really like the way they work but for those that have used them, there isn't much at the top used to hold them on. I have a couple of ideas but thought I'd see what's been done before I break out the tools. This picture from Max Bmw is a good representation of the set-up on my bike. TIA, Gary