The campaign explains the work of the teams, which provide counselling and other services to school children. The charity has 13 Schools Teams in England, Wales and Northern Ireland
The mail pack, created by Kitcatt Nohr Alexander Shaw, resembles a school exercise book and carries the words 'Top Secret!', 'Private' and 'Keep out!' scrawled across it, as well as doodles of bombs and weapons.
A case study included in the pack relates the story of a 12-year-old victim of domestic abuse.