Having made-do with an improvised rear rack whilst touring for quite a few thousand kilometres, I decided to invest in a better quality solution. However, lacking attachment points, I needed a reliable solution. The Salsa Rack-Lock Seat Collar was the ideal solution. Melbourne Powered were the only retailer that I could find that had the size I needed. Not cheap, but the collar works perfectly with a neat and robust attachment to the seat post. Perfect solution and well worth the cost.