The Lock & Lock Classic range uses a patented 4 sided locking system, and a silicone seal, to create an air and water tight storage container for all of your needs. Available in a variety of shapes and sizes Lock & Lock containers are ideal for everything from apple slices in your packed lunch to zips in your sewing kit. Suitable for both microwave and freezer, these containers are a great way to store, transport and heat food; they are also completely dishwasher safe and come with a lifetime guarantee.