Now that I've got some Ortlieb panniers I've become aware of all the accessories they offer. Most intriguing to me is the kit that converts a single pannier to a backpack. For just $39 retail, it seems like a useful accessory. However, I'm not sure if it's any lighter than just carrying a small backpack would be, but it seems well designed for cycling and way to get extra use out of your panniers. When touring, I have often found it useful to have a backpack to use once you get to your destination and set up camp. You could use it to pick up food at a local grocery or to carry swim gear if you went to the pool.

Anyone have one of these pannier converters or the Ortlieb backpack who could relate their experiences?

http://www.ortliebusa.com/CartGenie/prod-205.htm