I'd like to replace my toss-away plastic Glad containers with others that are great for refrigerating leftovers. Ideally, they would be able to go from the fridge directly into the microwave for heating. I looked at Pyrex glass containers with plastic lids, but the box says "no extreme temperature changes."

Does such a thing exist? How do you heat up your leftovers? (I want to avoid leaching plastic into the food.) Recommendations?