Long term: http://www.revzilla.com/motorcycle/cortech-super-20-tail-bag
Short term just use a cargo net: http://www.amazon.com/Heavy-Duty-Cargo-Net-Motorcycles-ATVs/dp/B003VLBPJA
DEFINITELY NOT BUYING THIS! http://www.amazon.com/Heavy-Duty-Cargo-Net-Motorcycles-ATVs/dp/B003VLBPJA/ref=pd_bxgy_263_img_y