Most storage containers take up precious cabinet space when not in use and usually require the lids and bases to be stored separately - which makes finding and pairing them a hassle. With the unique design of Nest Lock, container bases nest neatly inside each other, and lids clip conveniently together for efficient, space-saving storage. As each element is color-coded too, it's very easy to match lids with bases when you need them. All containers are BPA Free and feature lockable, airtight and leakproof lids making them perfect for fridge/freezer storage and for taking food on the go. Freezer, microwave and dishwasher safe (top-rack only). Before using in a microwave, remove lid and place loosely on top of container - do not close lid. Use caution when removing container from microwave as it may become hot during heating. To prevent stains, pitting or other problems associated with high temperatures, avoid overheating foods high in oil, fat, sugar or strong colorants, such as tomato. Not suitable for use in ovens or under grills. Polypropylene 89.1%, Silicone 10.9%. Contains: 4 x 34 fl.oz storage containers, 4 x lids. 7.75'' x 7.75'' x 3''