i put them straight into the freezeer in a plastic bag. they sort of freeze all together but are very easy to just crumble off the amount you want. they don't need defrosting as they crumble so easily.
I put mine in a plastic (freezer proof) sandwich box, but only lightly packed. It doesn't take up too much room, keeps them from drying out too much and it's easy to spoon them out as and when required.