I'm not sure how that bag was intended to be deployed. It was designed for kayakers. That same supplier has something like a throwable flotation device and attached line.

My intent is to secure the bag to the tramp, attach the free end to my harness and rely on my weight to pull the line out (if separated from the boat). In that case I suppose it would have to be packed, something like a parachute.

Any kayakers reading this thread?