The term ‘Bottled in Bond’ has been used as both a statement of age and a statement of quality. It follows a government-mandated set of guidelines, specifically that whiskey must be distilled on site, must be at least four years old and of the same distilling ‘season’, and bottled at 50% ABV. Boulder Spirits Bottled In Bond Bourbon is exactly all of those criteria, distilled, aged, and bottled in Boulder, Colorado, aged for 4 years, and bottled at 50%