The Bottled-in-Bond Act of 1897 dictated that Bonded Bourbon be bottled at 100 proof, aged at least 4 years in a federally bonded warehouse, and produced in a single distillery within a single distillation season. Jim Beam® Bonded adheres to these guidelines and is created from the highest quality ingredients to give you a taste of history. Bonded bourbon is preferred by bartenders as a superior mixing whiskey with fuller body and flavor that stands up in a mixed cocktail.