What does billy mean when he told him dynamite came in little packages?

The quote "dynamite comes in little packages" is often attributed to Billy the Kid, a famous outlaw of the American Old West. The statement likely refers to the fact that Billy was known for being a small, unassuming man, yet he was capable of great violence and power. The quote suggests that even small, unassuming individuals can be capable of great things, or that danger can come from unexpected sources.