STACK + NEST: Same-size containers stack securely, while different sizes nest neatly inside one another when empty for compact, space-saving storage LEAK-PROOF + AIRTIGHT: The leak-proof, airtight vacuum-sealed lid lock helps keep food fresher for longer and prevents spills on the go. The silicone seal removes fully for easy cleaning DURABLE GLASS: Premium borosilicate glass designed to withstand oven heat, temperature changes and everyday use. Oven, air-fryer, microwave, freezer and dishwasher safe, so you can cook, store, reheat and serve in one container BPA-FREE + REUSABLE: Made for lifelong use, these BPA-free containers are an endlessly reusable alternative to single-use plastic for everyday food storage, meal prep and lunches on the go INTERCHANGEABLE BY DESIGN: Compatible with the Black+Blum Stainless Steel Multifunction range and interchangeable lids, allowing you to mix, match and expand your food storage collection over time