Just purchased this product. Where is the pocket that you supposedly can put sunglasses and snacks in?? There is none on this one, unless you are talking about the opening for the bladder, which would be up against one's back.
My youngest daughter has this model, and there is no pocket. We got it for her when she was 5 for long hikes (10+ miles), so wanted the lightest one possible. My older daughter has one with several pockets (zipper and side), which come in handy for her perpetual collecting.
If your child likes to travel with provisions, I'd exchange for another model. This one's quite simple.