They sell the milk in bottles or plastic bags, but I've noticed the

small writing above saying "condensed" or something like that. Is that

powdered milk?

Ah, you thought it was regular milk.

What you see in the photo is called Сгущёнка/Sgushyonka. It is milk that goes through a heating process and sugar is added to it. In the end you have a tasty sauce, that can be used in a variety of desserts.