The ortlieb back roller design pannier pair the panniers are the same as the back roller classic bags however you have an option of 3 different modern designs the lightweight durable and waterproof panniers have been designed to conquer the most rugged and challenging bike tours back roller classic panniers feature the ortlieb ql21 mounting system for secure and simple attachment to almost any rack the back roller classic takes the name from the way that the bag closes they roll up with