JanSport make good solid student backpacks.  It's well made.  It's comfortable.  It has lots of pockets for staying organized.  It looks nice.  It's big.  

It has a 34L capacity and is 17 inches tall by 13 inches wide.  The straps are padded and adjustable. The back panel is also fully padded for comfort.  The body, the lining, the zipper tape and the woven label are all 100% recycled material. It also has an exterior water bottle holder.