User blog comment:Waters Knight/So Blake has a backpack...?/@comment-186.188.108.69-20140609024030/@comment-4010415-20140611052027

Actually, I think Blake's backpack is always there. We just usually don't notice it because her hair is almost always in the way, hence why Monty had to cut her hair short in the images he posted to show her backpack and how her outfit looks from behind.