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. Containers holds 2 1/2 cups each. Microwave save for reheating only. Top rack dishwasher safe. Manufacturer's lifetime warranty.