My 2-year old loves her Hello Kitty suitcase. Its a decent size with a nice-size storage pocket. We were able to pack a handful of shoes, outfits, accessories, hygienic products and plenty of extra diapers (especially with the use of packing cubes). Can easily pack enough adolescent outfits for a week-long trip (plus a few midday wardrobe changes).

Would be even better if it had expandable storage, but still gets the job done.