Sadly this happens to many wild and domestic animals. One of the worst offenders is the Yoplait yogurt cup because it is tapered toward the top. It is easy for the animal to get its head into the cup, but impossible to pull the head out of the cup, so the animal wonders blindly with its head in the cup until it is killed or dies of starvation.
Also, six-pack plastic rings that hold soda cans together strangle to death thousands of birds and other critters each year. Anything circular that a head can get into can be lethal for an animal who lacks the hands (or smarts) to pull the container off.
Seeing this poor kitten is so sad and horrifying. It is just one more reason never to litter and to think twice about how we discard our trash. Always crush your yogurt cups and clip the six-pack rings so animals are harmed if they stumble across what you have discarded.