Originally Posted by
pdlamb
Trouble is, it's hard to find a good 40F bag that's a reasonable weight; many are Wallyworld specials, and are reasonable to carry in a diesel F250.
There are plenty of nice light bags in the appropriate temp rating. The problem is that they are generally not real cheap. The Marmot Atom and Mountain Hardware Phantom 45 are two that should fit the usage very well if they are in your price range.
An
REI search for bags between 1 pound and 1.49 pounds turns up 7 bags, 6 of which should work very well for summer conditions. The down side is that they are $289 and up.