Milk bags is the cheapest and more sustainable way to get milk but frankly speaking they are not so functional or nice, so sometimes I just take carton packed milk which is twice expensive - 0,7€. Ugly plastic pitcher are on sold but as I said, they are quite ugly and they take lot of space in the Frigidaire. Fortunately Veiko Liis thought out something really awesome for his master thesis that solve this problem with a very cheap and functional plastic pitcher shown up here. It is simply great.
