Safe Material: This baby food storage container is made of high quality PP plastic, durable, BPA-free, non-toxic an and environment-friendl. Can be storage in the freezer and use the dishwasher to wash it.<br /> Airtight &amp; Fresh: Spiral opening design ensure the food would not leak out even with the liquid and keep the food remain fresh and clean.<br /> Including: With 3 different sizes boxes to meet your different needs for food storage and with tick-mark on the sideway which can help you control the amount of food. (S: 60ml, M: 120ml, L: 200ml).<br /> Compact Design: There are buckles on each lid of the pot for you to combine the same size box. The container and the lid can stack into others so it is easy to organize them. Space-saving and keep your kitchen neat and clean.<br /> Mark &amp; Clean: You can also write the note on the container with marker which can be wash by water. Each pot is separately so you can wash it after use and then fill the fresh food again.