Lock & Lock® storage containers have a revolutionary airtight design featuring a combination of four durable latches with a silicon seal. This design assures a tight seal every time and eliminates fear of spills when accidents occur. Lock & Lock® comes in a variety of sizes to fit every storage need and is designed to stack for space-saving efficiency. It's great for storing dairy products like butter or cheese. 3-cup capacity. Microwave save for reheating only. Top rack dishwasher safe. Manufacturer's lifetime warranty.