Believe it or not, both DD and DS got theirs at Five Below last year. I was fully expecting to use them as a "just to get by" item, but both of theirs lasted the entire year and DD used hers the whole summer for toting her stuff to the babysitters house. She is going into 4th grade, so she is a year younger than your son. I would actually consider going back for new ones this year - and probably will.