Although glass blowing was born during the ancient Roman period, due to the high cost of glass bottles at that time, most wines were stored in clay jars. Until the 17th and 18th centuries, glass bottled wine became increasingly popular, but the capacity of wine bottles generally ranged from 600mL to 800mL. At that time, Bordeaux had already gained a great reputation, and Britain, known as the "empire that never sets," was the largest exporter of French wine.
It is headache inducing that the unit of measurement in the UK is the British gallon, while in France it is the liter. For the convenience of conversion, the standard for transporting Bordeaux oak barrels is 225L, which means it is approximately 50 gallons; And practice has proven that this specification is also very suitable for maritime transportation. However, the question arises again: how many bottles should a barrel of wine be divided into? Smart people always come up with a solution, and they find that an oak barrel of wine can be divided into 25 boxes, each with 12 bottles and 750mL each. That is to say, 1 oak barrel=225 liters=50 gallons=25 boxes * 12 bottles=300 bottles * 0.75 liters. That is to say, one bottle is 750mL. So, the so-called one standard bottle theory was born.
It is worth mentioning that a box of wine has a capacity of 0.75L * 12=9L, hence the birth of the international standard box. Due to 9L being exactly equal to 2 gallons, it is now common to pack 6 in a box as it is exactly equal to 1 gallon.
