I'm happy that the US is adopting metric.

I don't know if you're just not from the US, but this dual labeling of groceries has been ongoing for decades. The US formally began transitioning to metric during the 1970s and has had plenty of dual uses ever since; it got cut short due to a mix of public apathy and active public disapproval, and when it was on its last legs, Reagan axed the metrification board early in his first term (not a defense, but it was seriously barely doing anything by that time because of public unwillingness to change). Rulers have inches and centimeters; there are imperial and metric tools; kids do learn metric in schools (usually in the context of a science class); etc. You aren't expected to know metric as an average functioning adult, but it's everywhere and useful to know in US society – usually just kind of in the background like here.

TL;DR: "Is adopting" said in 2026 in response to soda labels is a steep misunderstanding of metrification in the US.

We’re not. Except in inner cities where it’s thriving

We measure sodas bigger than this in Liters.

Not other liquids.... just Soda. Milk you buy a gallon of. Soda? 2 Liters. Saying you're gonna buy a gallon of Soda sounds very strange to an American. There's also 1 Liter bottles.

It's the one of the most stupid Americanisms.