BPA Free Twist Top Lid Certified B Corporation Preserve food storage containers are made in the USA from 100% BPA free, recycled #5 plastic, dishwasher safe and stand up to everyday use. The Preserve Small Food Storage container holds 19 oz. and is a friendly addition to any refrigerator or lunchbox. Containers have innovative lids which screw on tightly to keep food fresh. They also nest for easy storage.