I love Rubbermaid and this 9x13 casserole is so amazing! It's glass, but feels so light and thin. it's safe for freezer, microwave, dishwasher and oven safe up to 550°. This lid is not of course. So easy to clean! My only complaint is the lid. It doesn't snap tight. the sides are not hinged and they're a little loose so the lid isn't completely snug. otherwise I am in love with this and can't wait to buy the other sizes!