That's ridiculous. Inches are divided in powers of 2, but with the metric system you just add one more decimal place. So, any multiple of 100ml is an acceptable option at that level of tolerance. If you need a tighter fit, multiples of 10ml...
I don't think I have a single half-litre or full-litre glass at home and I live in metric-land. Plus, in Spain a customary measure for beer is a third of a litre (tercio, probably something like 330ml), which is also the standard measure of aluminum cans and small bottles. En un viejo país ineficiente, algo así como España entre dos guerras civiles, poseer una casa y poca hacienda y memoria ninguna. -- Gil de Biedma
