I wrote once before that the concept of waste has been distracting environmentalist for decades. Today I came across this exceptionally interesting article on food packaging. The main point is that packaging serves an important purpose - to preserve food. The longer food is preserved, the more likely it is to be eaten rather than wasted. Thus, packaging cuts down immensely on food waste.
I do however believe that some packaging, such as the excessive size of cereal boxes to ensure good shelf space, does not always result in benefits for consumers.