LL Beans description can be found here:
Weight 4 lb. 1 oz.
Fits to 6'6".
It has about 42 oz. of down (nearly 3 lb)
The stuff sack is very generous, about 10 x 10 x 15. But you can always get a different stuff sack. By kneeling on the bag, you can get it smaller by using a compression sack.