1.SAFE SILICONE MATERIAL WITH PREMIUM QUALITY: The food storage box is made by food grade silicone that is non-toxic, tasteless, odorless, non-stick and easy to clean. The material has a temperature tolerance range from -20 °C~220 °C. And they are microwave , zer and dishwasher 2.SET OF 4 SILICONE FOOD STORAGE CONTAINERS: Set of 4 silicone collapsible containers fit for different needs and different people. Your can use the small one 350 ml(1oz) for your daily y snack, the medium one 500 ml(17 oz) for your lunch boxes in the classroom or office, the large one 800 ml(27 oz) and the extra large one 1200 ml(40 oz) for yourself or your significant others 3.AIRTIGHT STORAGE AND SAVE SPACE: The snap buckles and vent valve create an airtight space, in order to preventing dust and maintaining the fresh of food for a long time. In addition, these collapsible food storage containers are also collapsible, which is easy storage and can be folded for saving space approximately 50%. Fits into almost all kitchen and pantry compartments or any cabinet or drawer 4.COLORFUL FOOD BOXES:The silicone containers with lids has red, blue, green, and yellow colors to brighten your lunchtime break. Color-coordinate your cupboards and meal prep or enjoy the cheerful containers while camping or traveling. Great replacement for takeout containers as they fold flat and transport well