Our 16 oz (ounce) Boston Round Amber Glass Bottle with Black Screw Cap is perfect for storing vitamins, herbs, supplements or other liquids and powders. The black phenolic poly lined screw cap keeps the bottle tightly sealed and leak free, ensuring that nothing gets out and no air will seep in – taking away the potency and freshness of your stored goods. The 16 ounce Boston Round Amber Glass Bottle with Black Screw Cap is also very useful for any medicines and supplements that need to be mixed together or combined with another substance