Sometimes you're just looking for a lightweight, compactable sleeping system that you might or might not need to use. The Brooks Range Elephant Foot bag is just that. Weighing just 18oz, the Elephant Foot bag is filled with 8.5 oz of 850 goose down. The 20D shell fabric is treated with a silicone on the outside for added protection and strength. DownTek treatment keeps down from absorbing moisture as well as body oils, both the moisture and oils can reduce the loft and warmth of the bag. The footbox is lined with a 40d nylon for increased durability in case you want to wear your boot liners in the bag or are throwing in a couple of water bottles for the night.