Backpack in Your Back Pocket

Sometimes you need an extra bag, but it's not every day that you find one tiny enough to fold into the palm of your hand. Lewis & Clark's collapsible, ultra-light ElectroLight backpack is water- and stain-resistant, brightly colored and -- best of all -- weighs a mere 3 ounces and tucks into a carrying pouch just a few inches in size. Cost: $27.