Here's an option, http://ontario.kijiji.ca/c-cars-veh...Top-Box-Motorcycle-Luggage-W0QQAdIdZ514893558. Don't know the model but looks to be about 50L. Fair offer would be around $150. Givi top case rack + M5 kit is listed at $150 plus tax from aviciouscycle. A little over $300 and you have a fair bit of waterproof/lockable storage. With the top case rack, that also gives you a good place to strap down a duffle bag sitting on the back seat for additional storage when required.