The Ortlieb Back Roller Classic QL2.1 Pannier pair. 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 QL2.1 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 a single clip and strap holding them shut. It’s basic, but it works very well, the roll prevents water from getting through while allowing enough slack to accomodate larger loads. The top hooks open and close when you lift the carry handle, which makes attaching and removing them a doddle.