Originally Posted by
mdilthey
Here's a question. Which have you found most acceptable for UL Touring?
1. A drybag strapped to a rack (when rack mounts are available).
2. An extra-large Carradice or Relevate Designs bikepacking seatpost bag
3. A seatpost rack with a drybag under 15lbs (when rack mounts are unavailable)
And is #3 taboo...
Lots of seat post rack failures on the Tour Divide, but if you stick to pavement you might be OK.
A Tubus will likely be lighter.
With a seat post collar and p clamps or a skewer mount you could have a pretty stable setup.
From memory, a seat post rack wagged the dog more than my Camper Longflap or my Revelate.