These boxes are perfect for your child's snack or lunch. They fit perfectly into their lunch box and you can place them in the freezer overnight to keep your child's food cold for a period of time. The covers stay put but they are still easy for little hands to open on their own. This will be the last lunch container you will ever purchase! Amazing quality and pretty much indestructible! :) 100% Food grade silicone Bento Boxes. Freezer, oven, microwave and dishwasher safe. Free of BPA, PVC, lead and phthalates.