Quote Originally Posted by jeff-oh View Post
I find a 20* and a 40* make a great all season combo. The 40* can be used in summer and is not too warm in 60F weather. If it is 70* or 80* at night then just a shirt and partially covered by the 40* is fine.
The 40* will also be good for that occasional dip into the upper to mid 30's with clothing. If mid-30* and below you have the 20*. If you are wintering the combo of both the 20* and the 40* together will get you to below 10* perhaps a little lower. I did just fine at -6F using two 20*bags one inside the other.

I find the 50* about useless. mid-60's and up you can usually get away with just clothing and a light jacket. So I find that 50F to 65F range a bit limiting for the cost. where a 40F or little lower will cover a broader temp range.

anyway... my thoughts.
Pretty much my thinking as well.