The phrase “the book is in the bag” is often used to express that success or victory is certain—that there’s no doubt about the outcome.
While similar to “the game is in the bag,” this variation adds a literary twist. It might refer to having all the knowledge (the “book”) secured, or simply be a playful reinterpretation of the original idiom.
Whether you’re finishing a project, acing an exam, or wrapping up a long journey—when the book is in the bag, you can breathe easy.