I decided this would be the winter of yoga - I've been hitting the classes pretty hard and just got my own mat (yes, extra long). I didn't have a pattern for a yoga mat bag, but I just sewed a tube, attached a circular bottom and folded over the top for a drawstring.My extra-long mat is heavy and I didn't want the strap to rip the fabric - this was the trickiest thing to figure out. I attached the strap close to the ends of the mat so it would pull on the ends of the bag instead of loose fabric. I also reinforced it with pieces of the strap on the inside of the bag. On the top strap I tried this technique to avoid pulling on the fabric around the strap. We'll see how it holds up.