I don't know if this qualifies, but I've got an old milk crate bolted to my rear rack and it works great. Like UptownJoe mentioned, I have a couple of bungee cords to hold some of the bigger stuff in. If you are going to be carrying anything big on a regular basis, I would suggest you get a solid rear axle. The QR axles tend to bend/break if you hit any bumps at speed 20 to 30# back there.