With my REI points and the coupon anyone have advice on a good lightweight bag. Been looking at the Sierra designs Zissou 6 or the 12 pretty hard. Also wondering about guys that have used the REI Magma. Not exactly the same comparison but still close. The two Sierra Designs bags are Dry down and the other is not. The REI bag had the best reviews same temp range but with 800 fill goose down not the 700 fill duck down as is common with the dry down stuff. Bob.