Why do scotch bottles have a bulb in the neck?

The bulb in the neck of a Scotch bottle, often referred to as a "shoulder," serves both functional and aesthetic purposes. Functionally, it prevents the liquid from spilling when pouring and helps capture aromas, enhancing the drinking experience. Aesthetically, it contributes to the distinctive shape of the bottle, making it visually appealing and recognizable in the market. Additionally, the design may also aid in producing a better seal for the cork.