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 ($5,000). 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.