Kings County Distillery Bottled-in-Bond is a style of whiskey considered the highest quality of American whiskies. Bottled-in-Bond is a designation that refers to American Whiskey distilled, aged and bottled entirely at one distillery, from barrels filled in one season, by one distiller. Finally Bottled-in-Bond must be at least 4 years old, and distilled to precisely 100 proof. In the old days, this was a way to protect consumers that were merely bottling up and adulterating whiskey from other distilleries. Today, consumers still sometimes have a difficult time knowing exactly where their whiskies come from, bottled-in-bond whiskeys are the solution to that problem.