Having a clearout today I found one of these that I brought from a work colleague a number of years ago and have never used. I don't think he ever used it either. They don't appear to be available any more, but this review explains it: https://nargalzius.com/blog/archives/2013/03/15/pacsafe-lidsafe-anti-theft-helmet-bag It's got a sort of wire net between the layers of material that is apparently difficult to cut. Has anyone ever used one? Or have any first hand experience with one? It looks and sounds like a great idea, but I'm trying to decide if I should keep it and give it a go, or pop it up on ebay. Trouble is it's a bit of a leap of faith to try it. .