This is my review of the Kelty Cosmic Down 20 sleeping bag. It is a 550-fill down sleeping bag that weighs only 2.5lbs for the regular (fitting up to 6′). You can buy it at www.campmor.com for only $80.
EDIT: The bag used in the video is a Granite Gear compression sack size large. Although a medium size would probably be a more proper size for the sleeping bag.