Resilient Bottled in Bond Straight Bourbon is a premium bourbon whiskey made in the United States. It is aged for a minimum of four years in new, charred oak barrels and bottled at 100 proof. The whiskey is made from a mash bill of at least 51% corn, with the remainder being rye, wheat, and malted barley. It is a full-bodied whiskey with notes of caramel, oak, and spice.