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I guess my question is what is the difference between back country bike camping and bikepacking? Most people on this forum and site seem to use the seat bags / frame bags combo. Why not racks? What is the difference?
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...Can a rack work, sure. But racks add unneeded weight and can fail if overloaded. I hope that helps.
I actually use a rack on my Fargo and will also use one on my soon-to be ready Pugsley, in addition to a fairly large framebag and handlebar bag. A rack does weigh about 20 oz, but gets the weight notably lower than a seat bag (at least for a person of my height). I then just strap a dry bag to the rack. The key to bikepacking, as mentioned above, is to go ultralight. Low weight and a small packed size is essential for every piece of gear, in my opinion.