This is my second purchase of the Jansport Boost Backpack.  My son had his first one for 4 years and it wore really well.  This backpack can take some very hard use day in and day out year after year.  It has been through it all and holds up well.  There is plenty of space.  My son has 7 high school classes which each have a book and binder.  He can fit it all inside this pack as well as large calculator, pencils,wallet and water bottle.  There is even room in the bottom for a jacket or extra clothes.