B.P.
I use freezer bags and just get out as much air as possible.
Just make sure that what you are freezing does not have potatoes in it. They do not freeze and thaw well. You can always add them when you reheat if you "need" them in your stew.
Here are some other suggestions foods that freeze well -- Chicken Spaghetti (I have a fantastic recipe), Spaghetti & Sauce, almost all casseroles (I have tons of recipes), & Taco Meat. If you need any more help feel free to PM me or just Google "freezer cooking" and you will find tons of info.
Good Luck!