Had to choose between a 0 degree and a 20 degree sleeping bag for a trip to the White Mountains.
I was going backpacking in New Hampshire in October and couldn't decide if I needed the extra warmth. I went with the 20 degree Kelty Cosmic bag to save weight and space, and just wore my base layers. It got down to about 28 degrees one night and I was fine, maybe a little cool but not bad. Anyone else have a good rule of thumb for picking a bag rating for shoulder season trips?