This bag is "double green" because it not only dispenses with the unnecessary plstic bags from the store but it re-uses blue jeans. Just think--every time you use this bag you will know that there are two less pair of jeans and thousand less plastic bags in a landfill. The Double Green Shopping Bag is so much fun to create. It makes a great excuse for a party. Invite your friends to bring their old jeans and get together for a sewing bash!