A (UK Imperial) pint is 568ml. I don't know what a US Customary pint is. (Fun fact: UK and US customary/imperial units aren't the same! Every country used to have it's own system. That's why the metric system was invented)
Interesting. I always assumed the cost of the actual product for things like this was next-to-nothing, with marketing/profit/administration/distribution making up the vast majority - thus making portion sizes basically irrelevant.