After you make your own butter, you'll need a place to store it. Consider the "butter bell" -
The butter bell is a small crock with a bell-shaped lid. You add some cool water to the bottom of the crock, then put your butter in the bell, turn it upside down and place it into the crock. The water forms a seal around the exposed butter to keep bacteria, insects, dust, and odors out. And you can forget ever putting cold butter in the microwave again, which leaves you with butter that’s more pourable than spreadable...More details at Mental Floss.