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. HEALTHY MATRIALS :Made from BPA free material that ensures containers to be safe and eco-friendly. Passed strict hygiene and safety tests of the US and German. CONVENIENT TO USE: Can be used in the microwave, freezer and dishwasher (top rack only). Whether it is storing leftovers or packing lunch, 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 containers! SET INCLUDES : one 9.7-cup container with lid, one 4.6 cup container with lid, one 2 cup container with lid , The enhanced version of the snap will be more durable than the normal version and light weight than glass. Perfect for a variety of occasions & events: workers, students and trippers and more.