OXO Tot Baby Blocks give homemade baby food the same care you put into preparing it. Easily portion, store, freeze, heat, and serve the meals you've cooked especially for your baby using Containers in convenient four-ounce sizes. Each container fits into the freezing tray, and has measurement markings to make portioning a snap. On the go The containers are airtight, watertight and leakproof. Peek at the clear Containers to identify the contents, then pop one into your bag for simple defrosting and feeding when you're out and about with your tot. An easy-open, easy-shut lid makes the Containers a carefree choice. Airtight, watertight, leakproof seal prevents messes BPA, phthalate and PVC free Microwave and freezer safe