I noted that many teachers sit with the following dilemma in summertime. Little ones bring along juices and yogurt to school and due to the weathe,r their snacks heat up resulting in it going bad or warm. Get a Wonderbag for your classroom. In the morning when they arrive place a sticker on their goodies and store it in the Wonderbag. In this way they can enjoy a cool, fresh treat at snack time.
Wonderbag can also be handy in Winter for hot porridge served at school or soup.