Securing Gerry Can to Jeep?

I have recently acquired a free 5 gallon gas can and would like to mount it on my Jeep for the times I'd like having it. But I had a 1 gallon plastic gas can stolen out of my Jeep once and I certainly don't want this walking away either. So how do you all lock them up? I see there are can holders out there for the can to sit into but do these help lock them? It doesn't look like it which is why I ask. Photo's would be nice if possible.