The company is cellobags.com, a division of Continental Packaging Corp, in Berwick, Pennsylvania. Even though they aren't local their product makes up for the shipping waste.
The plastic bags are not actually plastic at all. They are made from a material called BOPP, *Biaxially Oriented PolyPropylene. BOPP film with superior physical attributes was developed to replace cellophane. This raw material is inert and unaffected by most chemical agents occurring in everyday life. It meets the requirements of the US Food and Drug Administration and other relevant authorities throughout the world. Polypropylene contains primarily carbon and hydrogen, and includes no heavy metals or other environmentally hazardous substances.
The only concern with Mater-bi is that it is made in Italy. This is a concern when you take into account how the product is delivered and if it is sustainable.