NutriChef's Gray 24-Piece Stackable Borosilicate Glass Food Storage Containers Set has leakproof locking lids and are freezer-to-oven safe. These glass meal prep containers are crafted of high borosilicate transparent glass and can tolerate rapid temperature changes without warping or cracking. They are safe to transfer from freezer to oven in an instant and won't absorb stains or smell. Unlike plastic, this food storage glass meal prep bundle is free of chemicals and is environment friendly. Hot foods can be placed directly to the containers as no chemicals will leech into the food and lids are crafted of BPA-free plastic. Each leakproof lid has 4 locking snap points and a sealable air hole vent to create an airtight seal for food freshness. Hinged lids make the lid easy to flip open and shut. The containers are rectangle, square, and round style. They're dishwasher safe, making cleaning a breeze. Containers and lids are stackable and nest inside each other so they don't take up much space. This set includes two 12 oz. containers, two 21.5 oz. containers, a 35 oz. container, two 11 oz. containers, a 17.5 oz. container, a 27 oz. container, two 13.5 oz. containers, a 21.5 oz. container, and a 32 oz. container, all with matching lids.