There's a reason eskimos lived in igloos — the shape is incredibly efficient at using heat. Now you can pack your own igloo up the mountain with the The North Face Dome Tent. Offering an impressive 125 sq. ft. of interior space, this hemisphere-shaped tent can hold up to 8 people, weighs just 45 lbs., and collapses down to just 32" by 23". Other features include dual doors, two exterior windows with a chimney vent, and a rugged nylon Oxford exterior.