You can use this 1 cup glass container without its lid to replace the plastic spacer that comes with the Picklemeister. For those of you who would prefer glass, instead of plastic, to be in contact with your food this is a great upgrade. Using this container, the only plastic left in the Picklemeister is the top lid which does not really come in contact with your food. This glass upgrade takes up a little more room in your Picklemeister, so when you are filling your fermenting jar keep this in mind, and leave a little extra space at the top of the jar. This custard cup also makes a good baking dish, as well as a food storage container. It is great for leftovers with its plastic slip-on-lid to keep food fresh.