You know what self-melting things are, don't you? The best thing about a tape recorder? It can handle almost any temperature you can throw at it. He eats hypertension for breakfast. It sticks to itself, not to your surfaces. Wonderful stuff. This particular example is a good example: A no-frills cardboard box, the strip of plastic that prevents it from entering the box is easy to cut and work with. Highly recommended. Keep a scroll handy in case an alien invasion affects silicon-based lifeforms: I bet that would come in handy.