If you look at the Wikipedia page about the 2L soda bottle, it states that round metric numbers are rare in the US, but I don't know that this is accurate* - if I look at alcohol on Wal-Mart's web site, it generally seems to be in quantities of 750ml, 1.75L. That's hard liquor, but for example rice cooking wine is also sold in 750ml. Regular wine is standardized on 750ml (occasionally 1.5L) bottles as far as I know.
Then there are things that don't make sense in any units - there is a bottle of cooking wine that is 12.9 fl oz and 381 ml.
*And it had no citation.
In the 80s I was doing metric conversions in years 4 or 5.
But in my university engineering labs on machining and machine tools, it was all taught in inches and feet. Not sure if that's because that's what industry used. I never entered my career as a manufacturing engineer.
In other engineering disciplines (except maybe civil), it's all metric. You won't hear EEs talking about semiconductor feature sizes in fractions of an inch.