Clip & Close Glass Storage Containers: For Every Situation. From preparation and cooking to serving, freezing, and reheating – the EMSA Clip & Close glass storage containers handle all tasks. The perfect solution for any situation. These practical glass containers now feature an improved design with a special stacking edge and reinforced rim for non-slip stacking of boxes of the same size, as well as an even sturdier glass construction. Everything else you know and love: from the oven and microwave to the refrigerator and freezer, these storage containers are both heat-resistant (up to 420 °C) and freezer-safe. Additionally, they are 100% dishwasher-safe for easy cleaning and 100% hygienic for perfect food preservation. And one more thing that hasn’t changed: the German lid technology, meaning all you need to do is Clip... and Close!.