Our biggest concession to the mummy haters, the Mother Brown offers luxurious accommodations for those who like to practice their semaphore signals in bed. Two Mother Browns zipped together make and enormous double (triple?) with the zippers falling at the sides. This allows better individual temperature control which is an advantage because in most duos we know one sleeps colder than the other. This bag is warmer than all the so-called Arctic or Yukon bags but weighs in at half to a third of those archaic monsters.