Anyone on the fence with the ZenBivy system take advantage of this sale, literally the most comfortable bag I've used. I spent 30 nights last year in a sleeping bag and without a doubt my zen bivy is my favorite by a long shot. Only complaint for me was it did have a slight smell at first but got better over time. Don't skimp on a nice R value pad. I run the light XL bag, 10 degree, full 20 degree light sheet with a thermarest xtherm rectangle wide. If I could do it again I'd probably go with a large over the XL.