300winmag, when I meant rooom I meant more like lower body room. I've tried the Ultralite and though the room was very good at the upper body for me it was too tight at the knees. Going one step up the Megalite or Alpinlite are too roomy at the top (leaving me cold) but it still doesn't seem to give as much lower body room as the Marmot or MH bags such as the Helium or the Phantoms which is shaped more like a true barrel, thus there is more room around your elbows and knees.