Drawstring Backpack Drawstring Bags. Our non-woven drawstring backpack is made of eco-friendly 80 gsm non-woven polypropylene; corded shoulder straps and a draw string closure. The backpack has a 11 1/2" W x 12 3/4" H imprint area and is an ideal promotional item for schools; sports teams; camps and clubs. Choose from among the vibrant color options and have your company name; logo; or promotional message imprinted