Earthenware containers are vessels made from clay and other natural materials that have been used for centuries to store and transport food, water, and other liquids. The two most common earthenware containers are the JUG and the OLLA. A JUG is a container with a handle and a narrow neck, usually made of ceramic or glass. An OLLA is a large, round, unglazed pottery vessel with a wide mouth and a narrow base, often used for cooking and storing liquids.