Avoca Travel Storage Jar Unlike traditional glass or ceramic storage jars, The Peterson Avoca leather storage jars are extremely durable. Each jar is made from a hardened elastic polymer to ensure an airtight seal which is then wrapped in a subtly green leather exterior with a green zipped trim. It is stamped with the Peterson logo on the lid and the instantly recognisable Peterson "P" on the zipper. Perfect for travelling to ensure your favourite tobacco stays fresh whatever the weather.