What type of storage vessel is commonly used for unaged spirits?

The most common storage vessel for unaged spirits is stainless steel tanks. These tanks are preferred because they are inert and do not impart any flavors or characteristics to the spirit. This allows the unaged spirits to maintain their purity and original flavor profile, which is essential for products like vodka and gin that are intended to showcase their base ingredients' nuances.

Additionally, stainless steel tanks are easy to clean and maintain, making them practical for large-scale production. They also help to prevent oxidation and contamination, which is crucial in the production of high-quality spirits that have not been aged in barrels. This method ensures that the spirit remains consistent in taste and quality during storage prior to bottling.