Drawstring Backpack Drawstring Bags. Our Non-Woven Reflective Drawstring Backpack is made of eco-friendly water-resistant 80gsm polypropylene, corded shoulder straps, carrying straps and a draw string closure. The corners are reinforced with eyelets. Reflective Stripes are on top and bottom for high visibility. Black vertical lines on top and bottom highlight your logo on the large imprint area. The backpacks are an ideal promotional item for safety, schools, sports teams, camps and clubs