The pack is based on the idea of "Touch Wood" which comes from the pagan beliefs.
"Knocking on wood, also touch wood, is an apotropaic tradition of literally touching, tapping, or knocking on wood, or merely stating that one is doing or intending to do so, in order to avoid "tempting fate" after making a favourable prediction or boast, or a declaration concerning one's own death or another unfavourable situation. In some versions of the tradition, only one person, the speaker, is meant to "knock on wood"."
The idea behind this is that the pack can be taken anywhere with you at all times, in your coat pocket or bag. Then once a bad idea is thought or said you can read the instructions and follow them accordingly, resulting in your assured safety.