From mixing bowls, to casserole dishes, to containers for leftovers...these products have been around for over 100 YEARS! Their quality is just amazing and they withstand so much heat! My parents have been collecting the older Pyrex for years, many items of which still usable to full function! The only difference between the old and the new is that you CANNOT put the old in the dishwasher. I have been replacing all my plastic leftover containers with Pyrex for the last few years to promote sustainability. So far, many people have jumped on the bandwagon with me! Will you?