My name is Oscar, CEO of ALCHEMA. Thanks for sharing our site. According to our current design, the volume of inner bottle is 3L(0.67gal) which is about 3 bottles of wine. Feel free to contact me if you have more questions or suggestions!. [email protected]
Wine here is generally sold in 750 ml bottles. Some are larger or smaller, but they are either for special wines (like an Ice Wine) or a very unspecial wine sold more in larger bottles.