Old Elk Sour Mash Reserve - crafted with over four decades of experience from our Master Distiller, Greg Metze, passion and zero compromises. We took our award-winning flagship high-malt mash bill, and began the journey to discover what would change if we experimented with a different yeast. Our travels resulted in the unique Straight Bourbon Whiskey held in this bottle. The robust foundation that is our flagship high-malt mash bill anchors the heady complexities from the unique yeast. The result is a thirsty barrel small batch whiskey that transports you.