Yogurt in Beijing is often sucked through a straw rather than eaten with a spoon. It is a more liquid than what is offered in the US. My favorite type is served in a chilled clay mug, covered with a white piece of paper with an imprint of a cow on it, and sealed with a rubberband. You stick a pointy straw through the paper right there are the booth, drink the yogurt, and then leave the container behind.
The ones being sold here are in disposable packaging, with plastic containers and tinfoil lids.