It's hunky dory in warmer weather, but it ain't so warm anymore! I don't want to invest in expensive and bulky food containers to keep food somewhat warm. And to my knowledge there is no microwave at school. I wish I had the motivation to keep using my plastic and glass ware to pack food that tastes decent when cold or room temp and still satisfies for days when the temps take a dip. Anyone else run into this problem? Did you cave and buy insulated bento gear? How to deal?