I use this silk bag (tall) with my Clark hammock and my sleeping kit comes in well under five pounds, total. I don't have to worry about compression of the insulation with silk and it'll keep me snug down to about 35° or 40°(F) in the hammock with the WeatherShield in place. Allot of the time I'll just lay on top in the warmer climes and use a simple silk sheet over me. As another poster mentions, the bag can be kinda tight around the shoulders. I'm 6'6", 240lbs so I don't move around much when inside it. Overall it's a very comfy bag!
After searching and searching this bag is the perfect one to travel light in warmer climates. In our flight around the world we cannot take many weight nor a big volume with us. We like its smooth feeling and that it can be used with a travel sheet, which means you do not have to wash the bag too often. Its small size is great. The stuffing bag is just a little bit too small, otherwise great quality.
I will be hiking 500 miles in June across Spain on a pilgrimage so I needed a lightweight bag that was big enought to be comfortable for a month and wanted a zipper for when it was hot. This bag completely meets my needs. I would add 4 inches to the width to make it perfect.
I use my bag for motorcycle/car touring. At a BMW motorcycle rally this year it worked great - warm in temps down into the 50s, packs small and feels better than nylon. Only complaint is I find it a little snug around the shoulders, a very minor niggle, I'd definitely recommend it for warm weather!