When you're climbing 30,000 feet up Mt. Everest, you probably wouldn't be too thrilled about having to carry your feces the rest of the way up the mountain and all the way back down again. Turns out plenty of mountaineers feel that way, and clean-up crews have brought down 880 pounds of poop from the mountain since 2008. At least the frigid conditions limit the stinkiness of their cargo.

Eco-conscious mountain climbers can carry a Clean Mountain Can. The two-and-a-half pound plastic container fits 1.88 gallons of human waste—that's 10 to 14 typical uses. According to the manufacturer, the container can withstand a fall of 2,000 ft, so "oops, I broke it" is no excuse for not cleaning up after yourself.