The backpack seems very simple, but is it really? Jansport and Northface are the brands I see on the backs of students as we walk to class, the co-ho and any other destination that we may have.
I don't think we think much about the concept of the backpack. It is brilliant really. Whoever came up with the concept is amazing for doing such a great thing. I think the fact that so many people over look the brilliance of the backpack shows that it is a great design. It is an object that is hard to improve.
In Objectified, designers talked about the main qualities of a great design to include simplicity and ease of use. The backpack clearly has these qualities.