The humble hard-sided cooler continues to evolve into a more versatile, functional piece of every-weekend outdoor gear. Following up on last year's ice-salvaging rotomolded rollers, Coleman steps in a new direction it qualifies as a world first. The company's new Snap 'N Go series comprises nicely squared cooler boxes that stack and store neatly when full and even more neatly after instantly folding down to a fraction their size. These insulated briefcases promise to be the most space-efficient hard-sided coolers money can buy.