Enamelware is made with a base metal of steel, iron or aluminum that is covered with a glass-like material called porcelain enamel. Enamel is extremely hard-wearing. It can stand being heated to fairly high temperatures and frozen too, so there's no need to worry about it being fragile. Enamel is porcelain, which has been fused to steel, making it durable and smooth. 

This enamel bento box designed by Mitsou, is definitely a good choice for your next lunch preparation. If you prefer to use it other than lunch box, you can have it as your storage box, sewing materials and etc.