Ball Plastic 8-Ounce Freezer Jars, 5 Pack 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. Stackable nesting jars Easy twist on lids Canning fill lines All of our plastic jars and containers are bpa-free plastic and are dishwasher safe on the top-rack.