Double Green Shopping Bag Sewing Pattern. Just think - every time you use this bag you will know that there are two fewer pairs of jeans and thousands fewer 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 Double Green sewing bash! Finished sizes are 11 1/2"W x 12 1/2"T or 12 1/2"W x 13 1/2"T.