Ball Plastic Freezer Jar, 32-Ounce, Set of 3 All of our plastic jars and containers are bpa-free plastic and are dishwasher safe on the top-rack. Easy twist on lids All of our plastic jars and containers are bpa-free plastic and are dishwasher safe on the top-rack. Nesting jars The plastic containers, with a locking lid design and a leak-proof seal, can handle soups, leftovers, and frozen vegetables.