There are debates over who is responsible for reducing the amount of packaging in landfills: manufacturers and supermarkets, or buyers. In my opinion, both producers and customers should take some measures to handle the situation by reconsidering manufacturing policies and shopping habits.
One of the primary reasons for blaming companies is that significant improvements are impossible without radical and fundamental changes at the production level. In other words, even if 1,000 people develop new habits, it will be a drop in the ocean, as there will still be far more individuals purchasing packaged products only because they may be easily found on the shelves. However, hardly had these goods disappeared when people were left with no choice but to buy more ecologically friendly alternatives.
An opposite point to consider is that each person should learn how to take care of 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 lives. In countries where such behavior is common, people are more willing to sacrifice their comfort, for example, by turning off lights to minimize light pollution.
Finally, I think that all changes stem from collaborative work. For example, the government may use some regulations to compel manufacturers to find new ways of selling. Regarding work with the public, 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 obligations solely on producers and supermarket visitors, because any positive results are unthinkable without joint efforts.