Beer Bottles!

[ProfessorB]

Why are large beer bottles all 64cl volume? Why are small ones 33cl
100cl and 50cl makes more sense!

[heathfield]

The size originates as a standard in the Far East. Over 95% of large-size beer bottles sold in China are this size. It's based on sharing the bottle's contents, as it provides two full glasses of a size close to the 330ml we use in the West

[ProfessorB]

Thanks for this! It seems plausible enough.