Includes Uni-Mount attachment that can be used to clamp directly to one of the lets of the Aeroe Spider Rear Rack or other manufacturers 20mm diameter rack tubes, such as the Thule Tour Rack (Part# XT-7022) . Waterproof and highly durable bags that protect contents during road and off-road travels. Made from high quality 600D Nylon with TPU coating . High Frequency welded and sealed seams .