Early attempts at reusing—such as using chewing gum to patch leaky coffee pots and converting banana peels into prom corsages—failed abysmally. Give items new life the easy way with today's Groupon: for $26, you get four foldable water bottles from Vapur (a $43.96 value, including shipping).

Simple yet innovative, Vapur's half-liter, foldable water bottles help thirsty planeteers conserve both the earth and their valuable backpack space. Patrons receive four 18-ounce anti-bottles, which are dressed in blue, pink, green, and gray and are both freezable and dishwasher-safe, unlike the family dog. The contortionist bottles are BPA-free and hewn of an FDA-approved polyethylene liner, standing upright when full and attaching to hooks and straps with an included carabiner, or flattening and rolling when empty to fit easily into purses, pockets, or cheek pouches. Further demonstrating dedication to preserving the planet, Vapur donates a portion of all its proceeds to water-related and environmental causes.