- Upgrade your Cannachiloma with this one of a kind 4oz. Jar Jacket add-on. This mighty upgrade holds any 4oz. Ball Jar. Supporting the jar safely while still being able to visibly see the labeled lid. Behind the backboard of this product is a slot that will even hold the lid when your hands are full. Made of durable Forest Stewardship Council (FSC) wood with a magnetic exterior that attaches to the inside of any Cannachiloma!