I bought this backpack for my child, who will start kindergarten next fall. When it arrived, I realised how big it was. The main compartment is really roomy. It houses my 15'' MacBook, my padfolio, quite a few books, notebooks and pencil cases. THere's an insulated front pocket that could push your old lunchbox into  early retirement, or of counsel at least! One more front pocket holds and organises all your school supplies.
Two lateral pockets come in very handy if you have, like I have, to carry an epi-pen and a ventolin inhaler. I use the other one to hold keys, money, you name it. Right by the handle there's a smaller pocket.
As you probably have guessed by now, my daughter never got to use it.
I would not recommend it for younger children, but it's perfect for junior high and higher.