I am a teacher, I have to carry my books, copies, computer and video projector, across a huge establishment. This is why I opted for this bag. Overall I'm happy with my purchase because I can hang it anywhere. It seemed a little big at first but ultimately it allows me to put a lot of things. And I always have a free hand to carry the projector. It looks solid, runs well and the stem is easy to fold and unfold. I have never been on my back but I guess it can help. The price is reasonable.