Lock & Lock containers lock tightly to keep refrigerator odour out & keep food fresh. Good for storing various sauces, leftovers, canned goods, fruits, & vegetables. Refrigerator, freezer & microwave safe. Useful for other range of purposes as well. Lock & Lock are the No 1 Globally recognised product. The major problems with traditional air-tight containers are the lack of air-tightness & inconvenience of opening & closing lids, which have both been enhanced with Lock & lock&8217;s 4 side-locking system. One of the most important features of Lock & Lock products is the permeability of the container that keeps the freshness of the food rather than using an additive. The permeability of Lock & Lock products, in comparison to other brands, testing showed 200 times better at the most. The difference with Lock & Lock products to other similar four side-locking products is in the inside of the silicon. Lock & Lock silicon has a hollow inside, giving superior compression & restoration power for airtight lockage. Lock & Lock is friendly to the human body & have raised the standard of safety & functionality using superior raw materials with durability & heat-resistance. Lock & Lock was awarded the &8220; Quality certification” (Q Mark) & the &8220; Hygiene & Safety” (HS Mark) by the Korean Environment & Merchandising Testing Institution (KEMTI) as well as the &8220; Sanitary Finished” (SF Mark). In addition, Lock & Lock passed the strict hygiene & safety tests of the U.S. Food & Drug Administration (FDA), the German SGS etc.