Bottled in bond refers to American-made spirit that has been aged and bottled according to a set of legal regulations contained in the United States government's Standards of Identity for Distilled Spirits. The regulations are codified in the Bottled-in-Bond Act of 1897. In order to be labeled as "Bottled-in-Bond" or "Bonded," the spirit must be the product of one distillation season and one distiller at one distillery. It must be bottled and stored in federally bonded warehouses under the U.S. government supervision for no less than 4 years. The bottled product's label must identify the distillery by DSP number where it was distilled and, if different, where it was bottled. Most bonded spirits are whiskeys.