Probably a stupid question, but here goes... My hammock is still not here yet so i cant just go look. Im almost positive this cant work or i would have read about it by now. On a WBBB double layer, could you just stuff a sleeping bag between the layers for insulation, or would both layers be too compressed? If that wouldnt work, wouldnt it make sense for someone to make a hammock that the bottom layer hung far enough below the top layer that you could fill it will you own insulation, like an old sleeping bag or whatever else you could find??? Might be easier(cheaper) than rigging an underquilt? Thoughts?