Canada kept much of its packaging equipment after the change, so we buy 454g of butter (one pound), a 341ml bottle of beer (12 Oz), 1.14l of milk (1 Imperial quart), and so forth.
Things get further messed up when people call a 12 oz. bottle of beer a "pint" (nowhere near it, either US or Imperial!), or when a bar sells a "pint" of draft beer that contains 18 US ounces of fluid instead of the larger 20 Imperial ounces (the Ontario liquor licence board works in Imperial ounces) and few seem to know or care, at least after a few beers.
It's enough to drive me to drink!