So light at 27g, mine gets swapped between my handbag (yes I have such a thing) and the top of my pack where it gets clipped next to my keys. I often carry it instead of spare batteries for my main torch. It’s got a good main beam (up to 26 lumens) – enough to get you off the hill in the dark, and the strobe setting is ideal for signaling in an emergency. The red light is also handy for shedding light whilst protecting night vision. If you expect to be walking in the dark, there are bigger, brighter options out there, but it’s a super little emergency lamp. Two lithium CR2032 batteries included.