Driftless Glen Port Finish Bourbon Whiskey – Our Port-Finished Bourbon makes a great holiday gift! The bourbon drinkers in your life (yes, that includes yourself) will thank you for it. This small-batch features our flagship spirit, which has first been aged in new oak barrels for 4+ years and then finished in fresh Port barrels. Rich, fruity port flavor complements the bourbons spice and makes for the perfect sipper.