Very nicely done! I haven't tried a backpack - I have enough trouble wrangling tote bags - ☺
They are cute! But for the child's safety I would put their names on the inside so that only her (or his) friends know their name. I don't mean to put a damper on your loving project, it's just that there seems to be more evil people trying to lure children away and if they have a name to use, the child may think it's a family friend who knows them. Another way to personalize the exterior would be with a cartoon, toy or something that is special to the child and still makes the bag her own. Hugs