For someone who has only ever camped with a down sleeping bag and thermarest beneath (or even more cushy setups), this is fascinating to me. Part of me loves the idea of this kind of minimalist survival. The other part of me asks, "Wouldn't you rather have a sleeping bag?" So, if you'd humour me, why this sleeping kit over a stuff sac full of "modern" sleeping bag? Methinks this is more versatile, giving you layers to use instead of sweaty summer nights in a mummy bag that doesn't like campfire sparks. :)