4 oz. Amber Boston Round Glass Bottle (22/400). These are suitable for light-sensitive chemicals, essential and fragrance oils and offer UV protection. Our 4 oz. amber Boston round bottles are FDA compliant, so they can be used for food products, too. Traditionally used for pharmaceutical, chemical and laboratory applications, their use extends across all markets. Boston round bottles have a narrow neck size allowing for a more accurate pour when compared to other container types. They are, indeed, the ideal bottle shape for a variety of closure styles.