NutriChef Red has leakproof locking lids and is freezer-to-oven safe. These containers have 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 Bundle is free of chemicals and is environmentally friendly. Hot foods can be placed directly in the containers as no chemicals will leech into the food with 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 rectangular, square, and round style. They're dishwasher safe, making cleaning a breeze. Containers 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, and a 32 oz. container, all with matching lids.