Our 5 ml Euro Round Glass Bottle with 18-DIN Neck Finish, similarly, is a type of Boston Round Bottle. For instance, like the Boston Round. It has rounded shoulders and a rounded base. Glass makes a great choice for packaging due to its high clarity, it can be colored, has high chemical-resistance levels, and has an extremely high resistance to heat and cold. It is great for storing liquids such as E-Liquid, Cosmetics, Essential Oils, and Fragrances.