PATENTED LOCKING SYSTEM: containers are guaranteed leak proof (airtight and watertight) with our patented four hinge locking system and silicone sealing lid; This assures food to stay fresh longer and keeps contents in containers secure^ Made from free material that ensures containers to be safe and eco friendly; Passed strict hygiene and safety tests of the US and German SGS^ CONVENIENT TO USE: Can be used in the microwave, freezer and dishwasher (top rack only). Whether it is storing leftovers or packing lunch, Lock & Lock are convenient to use around the kitchen or for any other household needs. Wide variety of unique, stackable designs allows you to save space in your cabinets, refrigerator, and freezer^ LONG LASTING: Our containers are made from high quality materials that makes them long lasting, strong and durable. Cultivate a healthy lifestyle and save space, food and money by investing in some Lock & Lock containers^