* Made from tough, lightweight aluminum, this rack is designed to work with the Topeak Super Trunk Bag MTX, available seperately, * Just slide it on, clip it in place and you're ready to hit the trail with all your cargo securely in place* Rack may be used with out the Super Trunk Bag, just strap on your backback or book bag and your ready to go. Quick release seat post mount* 20 lbs capacity * This is a nice, very durable seat post rack that mounts easily without tools! Simple quick release lever used for installation and removal. Free shipping on all orders over $100.00! Al's one-liner (Don't get good at doing something if you don't like doing it.)