I do amateur astronomy, and one of the tools is a red flashlight (If you turn on your white light and ruin your astronomy buddies night vision, he'll probably knock your block off). But with the popularity of the new white LED's, red LED flashlights, especially inexpensive squeeze lights, are getting hard to find. This instructable will show you how to make your own squeeze light so cheap and easy, you won't mind loaning them to you friends that forget to bring things back...
Step 1: Gather the parts
There are so few parts, this shouldn't take long at all.
1 empty film canister (if you've gone all digital, go down to the local developer or camera store, they just throw these things away).
1 9vlt battery (doesn't even need to be a new one, I've found that ones run down to 7vlts will still light the LED's. So go replace the ones in your smoke detector, and use the old ones in your light.)
4 red LED's (I've used everything from the dimmer red "indicator" ones to the clear "Super-Ultra Bright") just make sure they are all the same.
A piece of packing foam, sponge, or packing "Peanut", about the size of the battery and about half as thick.