I lived in the US for couple of years and I would curse every time I forgot order small not medium. They are saying its all ice but here in Brazil there is quite a bit of ice too. When I ordered medium in the US I had to carry it with me for a couple hours while sipping on it cause I couldn't finish it in one sitting.

Bonus: their clothes are also bigger. I'm an L in Brazil but in the US I had to buy M.