Last summer I bought the 60 L model on a similar deal from Campmor... fortunately it was green.  I got it for my niece who was in the 5th grade at the time.  The supension is adjustable, so we got it fitting nicely even though she's smaller.  The material isn't quite as thick as my SealLine Pro Pack's, but it is still a quality product, and that is a great price.