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Mason Monster's Eco EZ Sipper™ is our Patented travel lid designed to fit a variety of canning jars and other drinking containers. It is made of BPA free, plastic free, Biodegradable Bamboo Fiber, Rice Husk and Organic Plant Material. This drinking lid fits tightly inside the opening of the jar and does not require the use of the canning jar lid band to secure it. The Eco EZ Sipper™ is the only lid of its kind and is currently available in five colors to compliment the Mason Monster Eco Insulator™.