Google shows that while it is out of stock, walmart and amazon sold them in the USA. Amazon reviews are from 2019 though. And one website named Albertsons show them in stock. Just googled "coca cola 3 liters USA" lmao.

In my country, 2.5 liter bottles are pretty common. And only plastic bottles I saw smaller than 1 liters are those crappy 125 ml bottles they try to sell to middle schoolers lol. Everything in between are either cans or sometimes glass bottles.

Except for water which coca cola is one of the big players of. So they definitely produce a shit ton of plastic water bottles of 0.25/0.33/0.50 liters. Also maybe sports drinks.

>largest can I’ve seen is a Monster around 700L

That sounds big, half liter ones looks pretry big already. I can't imagine a 1 liter can.