Bags may not be the greenest category right now, but Mountain Hardwear is out to change that. The Eco AF is made of almost all recycled materials, including its nylon shell, trims, and most of the zipper components (30 percent of the synthetic insulation is not recycled). And its ghostly look is more than a fashion statement: Not using dye saves about 80 liters of water per bag. As a sleep system, our testers gave this mummy bag solid marks. “I took it down to the temp rating in Catalonia and didn’t suffer any cold spots,” one says.