Jack Daniel's Bonded Tennessee Whiskey is Bottled-in-Bond, aged in select barrels for added depth and character. At 100 proof, the flavour delivers layered notes of caramel, rich oak, and spice giving way to a pleasantly lingering finish. The Bottled-In-Bond Act (1897) stipulates that the whiskey must be: From a single distillery; From one distilling season; Bottled at 100 proof; Aged in a federally bonded warehouse for at least four years (seasons to mature)