Our Glass Storage System not only protects the food that is stored in it, it also guarantees that it stays fresher for longer. All containers are made of high quality borosilicate glass. The crystal-clear lids made of Tritan are airtight and leak-proof. - Crystal-clear "Tritan" lid with removable silicone gasket for easy cleaning and improved hygiene. The Borosilicate glass is shatterproof. - 4 latches with real hinges ensure a longer life than so-called living hinges or foil hinges. The container is 100% airtight. - Food safe, BPA free, freezer safe, fridge safe, oven safe (without lid) up to 260°C/500°F, microwave safe (with loose lid), dishwasher safe. - Without lids, the glass containers are nestable for compact storage when not in use. - Designed by Zyliss, characterised by Swiss heritage, elegance, and functionality. - 5-year Zyliss guarantee for peace of mind.