I got one a couple of years ago. I wanted a clear light, and since I couldn't find any clear Nalgene bottles, I had to get a different (heavier) brand. It does do exactly what it says it will, but I just couldn't get any use from it. I use a headlamp/light now and find it much more practical and MUCH lighter. For a while, I carried it in the lid (fanny pack) of my bag. I kept an emergency blanket, whistle and water purifiers in it. My thought was if I could hang on to that fanny pack, I could survive. But it just weighs toooooooo much. The screws are a terror and it really only functions in one manner versus much smaller, lighter and more versatile lights.