They hold tightly: 100% airtight and waterproof; even liquids can be transported safely; the ideal storage for fruits, vegetables, sausages, bread, spices, cereal and eggs The original: the LocknLock lid is secured with four safety locks and cannot open by itself; the double chamber seal seals the food storage containers securely; Helper for the kitchen: use the boxes as a lunch box; cold food box; or food storage container; the practical tins have been bringing order to the storage for more than 30 years BPA-free: all containers of the PP Classic series are made of polypropylene; it is free from harmful BPA; all boxes are suitable for baby food; dishwasher safe; PP Classic: The practical multifunctional boxes of the PP Classic series are stackable; create up to 40% more space in the household; there is the right format for every application; suitable for fridge and freezer;