SAFE MATERIAL WITH PREMIUM QUALITYThe food storage box is made by food grade BPA free silicone that is non-toxic, tasteless, odorless, non-stick and easy to clean. The material has a temperature tolerance range from -20C-220C. And they are microwave safe, freezer safe and dishwasher safe. Unique DesignThere is a separate lid between the tiers so that the food doesn't touch the bottom of the tier above it, and the lunch box is more insulated; this thermal lunch box with bag usually keeps the hot food warm or cold for up to 2-3 hours ALWAYS READY FOR YOUR LEFTOVERComparing with old fashion heavy glass containers, those space savers are light weighted and easy to carry. You can always bring one of them with you, and start to protect our earth by using your reusable leftover container instead of a one time plastic bento box. Portable Versatile DesignThe personalized lunch box comes with an insulated bag and a set of portable flatware, perfect for everyday use in the office or school, as well as for camping, outings and other outdoor activities; with fascinating vibrant colors, it is also the perfect gift for women, family and friends Good ServiceWe offer perfect customer service. If you have any questions, please do not hesitate to contact us. We will do our best to help you solve your problem.