I've recently developed an interest in back country bike camping.  I don't know if that's technically the same as bikepacking, but it seems to be similar at least.  I travel cross country with racks and panniers for back country bike camping.  I do have a homemade framebag to carry things as well, but it doesn't seem to be as wide as some of the professionally made ones. 

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?

Thanks

Ironbirdexplorer