Drawstring Backpack Drawstring Bags. Our drawstring backpacks are made of eco-friendly 80 gsm non-woven polypropylene, It comes with corded shoulder straps and a draw string closure. The corners are reinforced with eyelets. The cinch bag has a front pocket that is being kept close with a hook and loop closure. The bottom of the pocket is accented in black to highlight your logo above it. The backpacks are an ideal promotional item for schools, sports teams, camps and clubs