This four piece Smart Seal Glass Rectangular Container Set from OXO comes with many features. They are made for meal prep, baking, storing and toting. The thoughtfully engineered lids come equipped with a leakproof and spill-proof silicone seal that is easily removable for cleaning, plus four locking tabs to keep food secure. Naturally BPA-free borosilicate glass construction means they can go from freezer to (preheated) oven without cracking or shattering. These versatile containers stack neatly in your fridge or freezer and nest in your cupboard when not in use.