I was working with my Sportsmans Guide tarp today. Didn't think this belonged in the DIY section since no special skills are needed. Was stuffing the tarp back into the provided bag (too much trouble to fold it) and had an idea which I'm sure someone has thought of but I had not seen posted here. Took a hot needle and made a small hole in the bottom end of the bag and routed one of the upper cords through. Instant Blackbishop sack for the SG tarp. Got the idea from Just Jeff's web page.