The ideal gift! Buy the best whiskey online. Price and reviews available for Heaven’s Door Double Barrel Whiskey – 750ml Bottle. Comprised of a unique blend of three different whiskeys, their double barrel finishing process utilizes hand-toasted, new American oak barrels for a secondary aging worthy of another year’s wait. Double Barrel’s higher proof balances perfectly with the complexity of its flavor and notes of caramel, oak, citrus, and spice.