Good idea...or velco or something?
Or could get a big thick piece of foam, cut it out so it fits in my boot, then cut out the shapes of my tool boxes etc and slot them in?
I do wonder about the virtue of having a jack and even a spare tyre. I mean firstly it is extra weight , and I've got RAC breakdown cover anyway, and I don't drive much outside the metropolitan area. I got a puncture last week so I figure that make me now very unlikely to get another one for years also.