From the product description, check product page for current description, price and availability:

• PATENTED LOCKING SYSTEM: Lock & Lock 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.
• BPA FREE & FDA APPROVED: Made from BPA free material that ensures containers to be safe and eco-friendly. Passed strict hygiene and safety tests of the US FDA 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!