it just crossed my mind about down items , sleeping bags , quilts , jackets etc , its allways been my understanding that they should be stored out of compression sacks , so they can loft . as not doing this will effect ther thermo doo dads . then i thought how long has the item been stored before you buy it new ? and the chances are they could have been compessed for maybe years ? so how come this doesnt effect the thermo rating ? or does it . ? all the best .