Jefferson S Straight Bourbon Reserve Twin Oaks Custom Barrel 90.2 750 MLJefferson S Straight Bourbon Reserve Twin Oaks Custom Barrel 90. 2 proof is a distinguished bourbon crafted with precision and care. This Jefferson S Straight Bourbon Reserve Twin Oaks Custom Barrel offers rich notes of caramel, vanilla, and toasted oak, balanced with a warm, spicy finish. The Jefferson S Straight Bourbon Reserve Twin Oaks Custom Barrel is expertly aged to develop a smooth, full bodied flavor profile that bourbon enthusiasts