I ordered this backpack for my son who goes to daycare, it is the perfect size for him! He is about 32" tall and around 23lbs.  I pack his water bottle, a snack box, a small toy, a book, and his stuffed animal and there is still extra room for two diapers and wipes if we're not taking along the diaper bag. This cannot be a school backpack, you won't be able to pack a notebook and a lunch box inside of it.

He LOVES his backpack and was so excited to find out it was for him when the package arrived and we opened it. The alien on the zipper adds a perfect touch and I'm also happy it is water proof. The only negative is that the inside is lined with some type of cheap muslin or gauze that seems as if it may rip at the seams.