There are lots of options for you to use when you were doing freezer cooking. However some are more economical than others in the long term, while some are more economical in the immediate time frame.
Ziploc bags are probably the easiest to use when you’re just getting started. You can often get them on sale, and they can be used again and again for vegetarian dishes.
You can also use freezer containers. You can buy them from Tupperware (if you plan on purchasing a lot, consider becoming a consultant for the discount) or purchase them inexpensively at places such as Wal-Mart or target. When purchasing freezer containers, buying one of the large economy packs with a variety of sizes and shapes is a good idea. That way you’ll have a container for just about everything.
Some people use aluminum foil. Just be certain that you mark anything wrapped in foil well. Writing with black felt on the foil itself is not the best idea, writing on marking tape, then applying the tape to the foil is best to make it easy to read.
The glass Pyrex casseroles are great. You can shop around and find these inexpensively. you’ll probably find the most versatile size is the traditional 9 x 11. Be sure at the when you select comes the lead to make it easy for storing in the freezer as well as labeling. Do keep in mind that he cannot take it from the freezer to the oven, you will need to defrost first.