Food grade silicone and PP material, non-toxic and safe for use. Safe to put in the microwave, dishwasher, and freezer. It is perfect for indoor food storage and outdoor activity, such as work, camping, hiking, travel, and more. It is great to keep dry or wet foods like cereal, fruits, vegetables, and baby foods fresh. The food storage container in 4 different sizes is designed to store different amounts of food.