My favorite is the Buck 2xAAA in a side by side config. This light is about the same size as a Micra folded. Rugged, waterproof and very bright. The In-line configured model has a tip which sucks up light and glows in the dark. Also has a pocket clip. Both lights activate by rotating the head( no switches to break). We use them a lot in the Arctic because they don't freeze to your skin in minus 40.