Below is a list of Coin Bank manufacturers from Saginaw, Michigan. Cardboard coin banks are a type of sealed paper tube or cylinder which are constructed with a slot in one end and are used to collect change and cash. A common use for cardboard coin banks is to gather donations for charities and non-profit causes by placing the coin banks at prominent locations within stores or at an event. Other uses include piggy banks, children’s savings banks and special funds savings containers.