I was in Guatemala once. Small size drink bottles were 12 oz, larger ones were 1 litre. Mixes of measures are not uncommon.

Here in Britain:
Petrol is sold in litres but roads are measured in miles. Unfortunately fuel consumption is only available in mpg or litres/100km, when it would make much more sense if it was reported as miles/litre or litres/100 miles. Some oldies have to convert litres to gallons in their head, to understand what they are buying, but I haven't discussed gallons with anyone for many years, except hidden in mpg fuel consumption measures.

The weather forecast is given in celcius as the prime measure, (with Frankenstein in parenthesis on occasion). Although a few over 50s still think in Frankenstein, celcius (often given its old name centigrade) is what is in common use.

Beer and milk are sold in pints, but all other liquids are sold in litres. So there is still an understanding of pints for consumable liquids.

Recipe books and scales still use pounds/oz with metric alternative. So although food is sold in kg in shops, pounds/oz remain deeply engrained. Personally I mainly use metric, though certain recipes I've been using for decades I still think in oz. US recipes in cups confuse us terribly. I have stuck a label on my scales 1 cup = 225g, for translation from US recipe books.

Even though in theory metric, a lot of packaged things are sold in amounts of "about a pound", sometimes precisely 454g, but often 400g, 450g, 500g. Although certain things have legally prescribed package sizes: wine can be sold as 375ml, 500ml, 750ml, 1000ml, and no other sizes in this range. So the old practice of selling you 720ml, 700ml, even 690ml I saw once, is outlawed.

Everything in DIY shops is metric. Working off plans, builders use mm. But people know their height in feet and inches and it is a rare person who readily knows it in mm, although that is how the doctor will record it on your medical records. People still give approximations in inches, even young people, though they never do any sums at school in such amounts.

So, apart from miles for roads (in fact it is illegal to measure roads in km, a council who put up some metric signs had to take them down) and pints for beer and milk, just about everything else is legally required to be metric in Britain. After 30-40 years, we are are increasingly getting used to them. But inches/feet and pounds/oz remain engrained in the culture, even for young people, even though they learn nothing about them at school.