Just returned from a late fall elk hunt in Central Idaho. Night time low temperatures were close to zero on the clear nights. Stayed nice and warm with the Browning Vortex 0 degree bag, a nice change from previous years. Also the price of the Vortex is much more reasonable than the competition. The shape of the bag is perfect, has enough room to allow a person to roll around without getting tangled up. Only slight complaint is that I had difficulty zipping the zipper to the top of the bag while inside as it seemed to catch on the cloth. But I am left handed so might have something to do with that.