The Hidden Llamawrote a review of Kelty Light Year Sleeping Bag: 40 Degree Down on December 8, 2011
This is a great lightweight bag for summer backpacking. It compresses really small and the included compression stuff sack is of great quality itself too. I've used this for a variety of summer camping/backpacking and have had no issues with durability or comfort. This bag is actually true to its temperature rating and I've used it for 38 or 40 degree nights comfortably. Only thing to point out is that it runs rather short. Specs say that the regular is good to 6ft, but if you're 5'10" or up, I'd go long.