I use a wide variety of containers to freeze in. I love the glass containers with silicon lids for reheating in the oven or microwave. Plastic containers I prefer to use for meals that get transferred to a pot to reheat - like soup or curry. The enamel tins are great for pasta bakes or lasagne that you want to put straight in the oven. I also freeze in disposable tin foil tins if I plan on giving food away.