Ok, so who has given some thought to this? When I see a small, lightweight modern head, I instantly think of how quickly and easily it could grow legs and disappear from the bandstand. I've considered things like those thin, flexible bike wire chains to lock them to the cab handle, or the Kensington laptop things (basically the same stuff), for those amps with some kind of perforation or handle to loop through. I've seen ones attached to a washer that could go under one of the feet.
But this stuff is case by case. Aside from taking it to the bathroom with you between sets, what's everyone doing to secure a small amp head?! Hopefully there's something reasonably effective, convenient, and not too cobbled-together?
PS Experts have already informed me that carrots, tort, or flats won't work!