Make everything about your food storage purely better with these Lock n Lock Purely Better 20 oz Square Food Storage Containers. Featuring a 4 hinge locking system for freshness that lasts longer, Lock n Lock Purely Better storage containers are constructed from made to last Tritan that is 2X as hard as traditional plastic. The airtight and leak-proof lid has been durability tested to last up to 3 million uses, and Lock n Lock Purely Better containers are microwave, freezer, and dishwasher safe. Always Bpa free, Lock n Lock Purely Better containers are stain and odor resistant, easy to clean.