The first thing to remember that a backpack shouldn’t weigh more than 10 percent of the student’s body weight. Second, only have the necessary items needed at any particular time inside the bag. That is where a locker could come in handy–remove the books that aren’t needed and store in the locker while adding the books from the locker that you do need. Third and most important, always clean out the backpack every month of unnecessary stuff that is no longer needed.