Komax Oven Safe Glass Food Containers &ndash; Microwave & Freezer safe - Airtight Storage with Snap Locking Lids - 6 Piece Set - BPA-FREE QUALITY DESIGN: Komax uses premium grade materials to bring you industrial and restaurant grade glass to your home kitchen. LEAK PROOF STORAGE: With side locking lids, this 6 piece set of rectangular containers is easily sealed, air tight and spill proof. STACKABLE LIDS: Made with a special non-slip design to prevent falling during stacking, they stack well in your fridge or freezer. BOROSILICATE GLASS: Heat resistant up to 1100f, and thermal shock resistant up to 248f. Can go from frozen to oven or microwave. STORAGE AND TRAVEL: The perfect solution to store leftovers, frozen dinners or lunch, or they can be used to store travel meals.