Personalized Bob is a Unicorn Drawstring Bag. Bob is, indeed, a unicorn. He just needs to believe it, and he can be it. Bob is a Unicorn Drawstring Bag - Black, from the children's book "Bob is a Unicorn" by Michelle Nelson-Schmidt. A durable and versatile cinch bag built to handle daily use. . With its lightweight design and reinforced corners, this pack is perfect for the gym, travel, or everyday activities.