[Myka]

I actually use a dish-type thing, not a lid. I've seen other people use lids, but I can't find any that are heavy enough to sink. The dish I use I have no idea what it is for or where I got it, but it is about 2" cube, flat sides, open one side, and glass. I lay it on its side and prop the open end up a bit so the food sinks down to the back of the dish. It works well.