The largest backpack in Brooklyn Industries line, the Bond.
You could always bring it to a lab and have it tested. Of course, you can also get a disk for your washing machine. This loosens the tension and the banner hangs much better. No matter how much you nurse a grudge, it won't get better.
This allows for a smoother, more even line without the muscle strain. If you are going to do swags or many banners out of the same color, be sure that the nap is going in one direction. It is easy to forget that something is wet or not completely set. Jean, in talking with a textile conservationist, unbleached muslin that has been washed several times is often used. Colorful and symbolic, banners are being rediscovered as important elements of worship.