most portable AND warmest
Its got my vote. Just be mindful of the 2 valves, one stays shut, while inflating. Bag works well as inflater and the "mat" basically becomes a air bed. Used on a negative chilly nite (along with a or advanced bivy) and its the only way to get a bags rating out of it. The ground is the most heat robbing point in a sleep system, thus this is as and even more important than a fancy bag. OR along with backcountry.com looking forward to other items, great return policy.