The Rubbermaid DuraLite 2-Piece Rectangle Baking Dish is made for heat tolerance and durability. The Manufacturer claims that this elegant yet versatile baking dish goes from the oven to the table, the fridge or freezer and right into the dishwasher! I was really skeptical about the durability of this product as it is made with very thin glass. To be honest, I was terrified to put it into the oven, but the backside of the dish indicates that it can withstand heat up to 550 degrees. So I thought, here goes! The first dish we prepared was a corn pudding and it turned out beautifully! The top does not seal but it is okay for a dish stored in the fridge but not always practical for traveling. I would definitely recommend this stylish dish to others.