Bottled in bond

American spirits, most often bourbon or rye, produced within the regulations of the Bottled-in-Bond Act of 1897. These spirits must be produced in a single distillation season by a single distillery, mature in a U.S. bonded warehouse for at least 4 years, and be bottled at 50% ABV. Bottled in bond whiskey may also be referred to as bonded whiskey.