This is not a full size back-pack, it's not intended to be sent to a school and be functional in that setting. It's a "for fun" back pack.
We've have purchased so many of these... and I see them be used over and over again. We have given a skip hop back- back to 4 nephews, 2 nieces and our son. It makes the perfect gift bag to fill when a child is in that awkward stage between baby toys and toddler/ kid toys.  Not surprisingly, this gift idea is "stolen" by people who have received one from us. They buy one for the next birthday party they have to attend and thank us for the great idea.

I have seen them used to tote toys on long car rides or trips to relatives. For a change of clothes when a child is potty training and has has to leave the house. To carry stuff around the house when little eyes are bigger than little hands. To bring valentines into school. For kiddie sporting events and the gear involved. (Karate uniforms, little league baseball gloves... etc.)
I see tons of them at my son's special education pre-school, because they are the perfect size to be hung off of kid sized walkers.

The colors are terrific, and the bag always stands out.
They hold a surprising amount of stuff (I think my son stuffed around 100 trains in his once...)
They are always a favorite for our family!