An empty e-liquid dropper bottle is a small container that is used to hold and store e-liquid, which is a liquid solution that is used in electronic cigarettes and vaporizers. E-liquid typically contains a mixture of propylene glycol, vegetable glycerin, flavorings, and nicotine (in some cases). The dropper bottle has a narrow neck and a rubber dropper top that allows the user to easily dispense small amounts of the e-liquid by squeezing the dropper. When the e-liquid has been used up, the bottle can be recycled or reused to store other liquids or substances. Empty e-liquid dropper bottles are typically made of plastic and come in a variety of sizes and colors.