I do not think this is a good solution for everyone. The weight you cite is NOT light! That said, my partner uses a simlar system and is very happy with it. He has an 800-down expedition parka and had an elephant's foot made specifically to fit him by Feathered Friends (Seattle manufacuter). He is a claustrauphobic thrasher when he sleeps. Now he sleeps better. Also we are climbers. The parka is taken on climbs as emegency gear. We have been caught on a climb before and had to bivouac. And he gets to get "out of bed" and keep on a plush parka in the mornings! The total weight of his system is the same as my 10-degree sleeping bag 2# 14 oz. But for most backpacking purposes, I do not think it is the best solution and it is expensive too.