BOROSILICATE GLASS: Borosil lunchboxes are crafted from premium borosilicate glass, known for its extreme temperature resistance and durability, making it perfect for daily use and commuting. LEAK-PROOF, AIR-TIGHT, BPA-FREE LIDS: Designed to keep your food secure, our lunchboxes feature leak-proof lids with a 100% airtight seal, ensuring freshness and preventing any odors from escaping. MICROWAVE & FREEZER SAFE: Easily reheat your meals directly in the lunchbox without needing to transfer to another container. They are safe to use in both microwave and freezer.