Have you ever thought about how unnecessarily bulky flashlights are? Think about it, they are relatively simple devices. You need only a bulb (or in the case of LED flashlights, a few LEDs), a power source, a switch and the wires that go between them all. If you’re looking for the most minimal flashlight possible, I’d say that this Battery LED Flashlight is exactly what you need.
The actual flashlight is only about a third of the size of the 9V battery that it uses for power. You need only clip it on to the battery and press the power button. This may not be a revolutionary product, but it’s still pretty neat, especially at only $7.50.