Q:

Non-glass baking containers for both microwave and oven use

Are there any lightweight baking containers that can be used in both microwave and oven.  I have bought prepared meals in these but have never seen them for sale. I do not want glass.

A:

The material you'd want is silicone.
For example, there are silicone baking molds. They are often used in professional kitchen settings, but I'm sure you find find some online. Here's an example.
There are probably other kinds of silicone containers that can handle oven well, and they can definitely handle microwave. 

