Ball 85040 1-quart freezer preserving container, 4-cup. You can preserve your favorite fruits and vegetables without sacrificing convenience with updated Ballï¿½ï¿½ Brand Plastic Freezer Containers. The new locking lid design creates an airtight, leak-proof seal to keep preservers favorite ingredients, leftovers and kitchen creations at their freshest. Features: BPA-free plastic. Adjustable dials allow for recording the freezer date for quick storage-time reference, and because the dials are adjustable, you can use this container over and over. Locking lid snaps securely in place to seal in freshness and protects against messy spills. New 'freshness ridges' in the base of the container allows cold air circulation for efficient freezing. Fill line measurement markings are easy reference for recipe preparation and portioning. FDA approved for use with all types of food, including those containing fats and oils. Top-rack dishwasher safe and microwave safe for defrosting.