I freeze everything in glass, from ready-made meals to baby purees to breastmilk.
Pyrex makes a line of freezer/oven safe glass baking dishes that have BPA-free lids (the gray lids, NOT the blue lids). I use these for everything from soups to chili to lasagna to casseroles, etc.
For baby purees, I use Ball (aka Kerr) glass jars with the plastic (BPA-free) lids. They make tiny little "jam jars" that are 4 oz, and the perfect size for baby foods. The lids screw right on, and are very easy to use. They cost around $10 for 12 jars, so the price is hard to beat. I found mine at Ace Hardware, and I believe Walmart also carries them (but I don't shop there).
For single serving soups, spaghetti sauce, etc, I use pint-size Ball jars, also from Ace Hardware. Sometimes I will also reuse glass containers from jam jars, coconut oil, etc....
For breastmilk, I pump and freeze in Evenflo glass bottles. They are super inexpensive at $4.50 for 4 bottles at Target. They fit onto the Medela pumps without any need for an adapter.
For dry goods like rice, etc, I use the largest size Ball jar, available at Michaels Craft Store for $3. I love using glass!!!