If you’re looking for the best warmth to weight ratio on the market, the Kiwi Ultralight Quilt 850 Fill Down is the one for you. This is not a sleeping bag, it's the next step up in outdoor sleep systems allowing you to recreate the comfort of your bed while hiking. Quilts are open on the underside and designed to be attached to a sleeping pad or hut mattress using the included pad straps. Quilts have the advantage of being lighter than a sleeping bag of the same comfort rating (given that the compressed down on the bottom of your sleeping bag provides no insulation). Additionally, Kiwi Ultralight quilts are labelled by comfort rating rather than limit or extreme rating, so you're certain to be warm at the temperature listed. Filled with premium, ethically sourced goose down.