Brooks Auto Sports builds a very robust after market pannier system for the BMW R1200 GSA motorcycle. These panniers are very well built, easy to install, and are completely waterproof. A complete set is about $800 less than the original equipment panniers one can purchase with their GSA. I have been using these panniers for a few months now, and they are every bit as sturdy as the OEM panniers were. And, the Brooks panniers are truly waterproof, unlike the BMW bags, which began to leak after a year of service. I highly recommend the Brooks panniers!