It is technically possible to remove the indoor blanket without
   removing the outdoor gear, if the outdoor gear is left in a random mess
   by being ignored when the indoor blanket was pulled out from among it.
   The random mess would not have the tarp over it to prevent rain.  The
   tarp works, despite its holes, because the wool blanket I have tied to
   it with bark guides the water to the edges with its capillary action.