Drawstring Backpack Drawstring Bags. Our clear drawstring backpack is made of heavy PVC (polychloride vinyl) material with reinforced corners, black trim, corded shoulder straps and draw string closure. This backpack meets the requirements for a security bag for any, PGA or other sporting events. Great item for schools, sports teams, camps, clubs and work places that require clear bags. Measures 12" wide by 12" high to hold camera, cell phone, hat, water bottle, and more