What are the colloquial names for juice boxes like the one below of children's size?
A juice box, also called a carton or popper, is a small container used to conveniently carry and consume drinks (most often juice). They are frequently made of paperboard with an aluminum foil lining, but variations exist. Juice boxes are most popular with children, although other uses include emergency drinking water and wine. (Wikipedia)
Best Answer
I've only ever heard these called juice boxes. I was not aware of any other name for them. But you've actually answered your own question in your question, with the information from the wikipedia article you linked:
I've never heard carton or popper, but those might be regional terms (or BrE?). I'd just stick with calling them juice boxes. But the answer is in the question!