Space-challenged in that bulging backpack of yours? Vapur's 16.9-ounce bottle is for you. When full, it stands upright, but after you've sucked down all your water, it folds or rolls up for easy, space-saving store. No more hitting people in the arm with your thermos in those crowded hallways. If you have a freezer, you can even freeze the entire bottle with your water inside for blisteringly hot days. The Anti-Bottle is dishwasher safe, but also can air dry, and comes in seven neon colors (eerily similar to iPod's options, if you want to match your accessories).Vapur 0.5 liters Anti-BottleRetail: $12.15