We had a big push to try to adopt metric for a bit. It stalled out for various reasons, but it ended with metric units being required on food and stuff, metric being the official system of the government, and new things introduced in that period being referred to in metric.
So beverages come in 8, 12, 16, and 20oz, 1 liter, 2 liter, and gallon.

We also print both units on just about everything.