v carpenter wrote an answer about The North Face Dolomite Bx Sleeping Bag: 20 Degree Heatshield on October 14, 2010
One bag will be on top of the other, rather than each bag side to side. the right zipper on the top will become a left on the bottom. We have two identical bags and zip together top and bottom constantly for both van and tent camping. You just need to ascertain that your bag opens all the way flat.