I bought a very similar looking pack at EMS and keep it in my pack as a stuff sack which can also be used as a "summit bid" pack if I was ever so inclined. It might have been useful on a backpack when we circumnavigated Owls Head. One of our group didn't want to bag the summit, as she had already gone there and didn't care to go again and would watch our big packs. I, for one, dislike leaving my pack on the trail.