A Ton of Bricks

A Ton of Bricks is a heavy book that Chyna is reading in PatANT for an assignment possibly from an English teacher and it apparently weighs "a ton of bricks".

History
When Fletcher and Olive see this, they come up with a "billion dollar idea" which is massaging backpacks and other ideas because of Chyna's struggle with her backpack. This starts a war with the main characters to see which backpack is better.