Pak-Lite: The world's simplest flashlight

The Pak-Lite is a very simple concept that has a definite appeal for hikers and other travelers with an eye on keeping their carry weight down. It's basically a battery cap that also happens to contain a three-way switch and two ultra-bright LEDs, and which happens to have survived the Pacific Crest Trail and the Appalachian Trail, three months in a freezer, 45 days frozen in a block of ice, and a drop from an airplane traveling at 100mph. It's a flashlight stripped down to the bare essentials, where the battery itself is the grip. The next time you need a light that doesn't weigh much more than a 9-volt battery I suggest you give it a try. It also comes in an infrared version--which would come in handy for both night-vision users and those interested in infrared photography--and a flashing version for those that need an emergency signal.