Four 187ml pours equals 748 ml, equivalent to almost a full bottle. Also: 187ml is 6.3 ounces. • A 375ml container is half a regular-sized bottle. We tried two of these in sleek aluminum cans.

But beyond appearances, plastic bottles are distinctly different - they weigh about 30 per cent less than glass ... almost 50 per cent of Smirnoff Vodka in 750 ml bottles now sells in plastic ...

The 750 ml bottle has been the standard for the United States since the Carter administration adopted metric measurements in 1980. Similarly, European-sized spirits bottles were banned to protect ...