Made from 100% flexible, BPA-free food-safe silicone, OXO Tot Silicone Baby Blocks are airtight and watertight for safely stacking, storing and transporting homemade baby food. Push-on leakproof lids automatically seal to keep food fresh and prevent diaper bag disasters. Built-in measurement markings make it easy to portion purees and the included storage tray keeps your fridge or freezer totally tidy. Clear construction means no guessing what's in store--freezer, microwave and dishwasher safe. Available in 2 oz/ 59 ml and 4 oz/ 118 ml.