The Lock & Lock HPL813L 2.4ltr, tall rectangle airtight containers lock tightly to keep refrigerator odour out & keep food fresh. Ideal for storing various sauces, leftovers, canned goods, fruits, & vegetables. Refrigerator, freezer & microwave safe. Lock & Lock are the No 1 Globally recognised product & it all began with the search for a revolutionary sealing mechanism that would be more secure than anything that had gone before...a search that led to the creation of Lock & Lock. This unique patented system brings together superb design with fine tolerance manufacturing, modular silicone seals & four seperate locking hinges, resulting in a range that is internationally acclaimed for its performance, practicality & good looks. 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.