Sol Light, a design company based in Hood River, Oregon, has improved upon the standard Nalgene bottle with its Light Cap, a one-liter bottle equipped with solar-powered LED lights. Activated by a rugged, waterproof rocker switch, the LEDs receive power from a photovoltaic cell mounted in the cap. The unit charges in daylight and supplies enough juice to provide light throughout the night. The white is good for searching for the Philips head in the engine room or reading the latest issue of Sailing World. The red is perfect for looking for government marks and not wiping out your or others' night vision.