It's hard not to flip over the versatility of the warmest member of the Tumbler collection. This lightweight bag keeps you comfortable on the 50-degree side and toasty on the 30-degree side. The combination of layered and quilt-through construction gives the Tumbler it's versatility while the zipper draft tube keeps the warm from escaping through the zipper. The Tumbler 30/50 is one of Kelty's only bags with a cotton blend liner, you'll sleep like a baby wherever you are. Includes stuff sack.