http://www.google.com/search?q=thermos+lunch+box&hl=en&tbo=u&tbm=isch&source=univ&sa=X&ei=sc8KUd67E-rW2wWF6IHYCw&sqi=2&ved=0CIUBELAE&biw=1186&bih=847
Or simply go to a local supermarket with your kid, see which type she/he likes.
http://www.google.com/search?q=thermos+lunch+box&hl=en&tbo=u&tbm=isch&source=univ&sa=X&ei=sc8KUd67E-rW2wWF6IHYCw&sqi=2&ved=0CIUBELAE&biw=1186&bih=847
Or simply go to a local supermarket with your kid, see which type she/he likes.