You know I love freezer cooking. Below are the tools that are invaluable to me when I do my freezer cooking. I will link to products either that I buy myself or something very similar.
First of all I don't think I could get nearly as much done if I did not have my two slow cookers. I have the big oval one and a regular one.
I have 3 jelly roll pans and I wish I had more because they are great for flash freezing foods. When I am doing a lot of freezer cooking I keep transitioning them out.
Foil and plastic wrap - I get the industrial size at Sam's and it lasts forever - like years.
Foil pans - now these aren't necessary but you can get 30 of them for around $6 at Sam's and I use them for when I make meals for church so I have extra on hand and they are very convenient for lasagnas and casseroles and such.
Freezer Bags - quart and gallon - must have (I think). Do not try to buy cheap bags here. You will regret it when they leak all over your refrigerator when you are thawing them. Again, I get them in bulk at Sam's unless there are some great coupon deals for them.
Strainers - I use these quite a bit and I have two. They just seem to come in handy.
Big stock pot - I use it for cooking whole chickens mostly, if my slow cookers are full of something else.
Cookie scoops - use them for cookies (Shocking right!) and meatballs - I use the bigger size but I guess it depends how big you want your cookies and/or meatballs to be.
9 x 13 inch pans - I have several but you should at least have 2 on hand.
Mixer or Bread maker (or I prefer to use both) - I use this for mixing up cookie dough, pizza dough, and any other dough I might do.
Muffin pans - for doing muffins and mini meatloaves.
Large storage containers - for rising bread dough - I use these mostly for my Artisan Bread in 5 Minutes a day. I used two of them last time since I made 6 loaves of garlic bread. I bought mine at a garage sale. I think you can get them at Sam's as well.
Am I forgetting anything? What tools do you use when you do freezer cooking?