Each container is made of BPA free food-grade silicone that is non-toxic, tasteless, odorless, non-stick and easy to clean. Heat resistant, can be used in refrigerators, microwave ovens, dishwasher safe. The food storage container is really easy to clean, when you feel that the silicone collapsible bento box need to be washed, just toss in the sink and rinse with water. This food container is dishwasher safe, also freezer safe for conveniently storing leftovers, and microwavable for when you need to warm your cold meal right from the fridge. Do not worry about that it can not withstand the heat of a microwave. Heat resistant, can be used for microwave and ensured for multiple times uses. Can store food and fruits in a refrigerator and also a portable lunch box for office workers, very practical food container for travel, hiking, camping, picnic and other activities.