The 7's Cobalt Blue Glass Mixing bottles come in a variety of sizes and two cap styles. Currently we offer 15mL (.5 oz.), 30mL (1 oz.), and 60mL (2 oz.) bottles with standard caps or dropper caps. These bottles make it extremely convenient to store your liquid for longer periods of time and give you the ability to mix your flavors! It is also now possible to mix your e-liquid strengths between high and non-nicotine levels.