There are debates over who is responsible for reducing the amount of packaging in landfills, manufactureres and supermarkets or buyers. In my opinion, both producers and customers should take some measures to handle the situation by reconsidering manufacturing policy and shopping habits.
One of primary reasons for blaming companies is that significant improvements are impossible without radical fundamental changes at production level. In other words, even if 1000 people develop new habits, it will be a drop in the ocean, as there will be still far more individuals purchasing packaged products only because they mey ne easilu found on the shelves. However, hardly had these goods disappeared, when people left no choice but buying more ecologically-friendly alternatives.
An opposite point to consider is that each person should learn how to take care for their future, remembering that each small step leads to bigger ones. By avoiding food in containers, people will gradually become more ecologically-minded and clearly realize that they are in charge of their own life. In countries where such a behaviour is common, people are more willing to sacrifice their comfort, for example, by turning off light to minimize light pollution.
Finally, I think that all changes stem from collaborative work. For example, the government may use some regulations to compel makers to tweak their attitudes to pacjaging. Regarding work with the public, the certain values might be promoted to make people think about how their daily actions may influence their future.
In conclusion, it is wrong to impose all obligation solely on producers and supermarket visitors, because any positive results are unthinkable without joint efforts.