タイタン緊急ホイッスル; Vargo

Barely notice it on my keychain—that titanium build really is featherlight. Blasted it once in the backyard and the sound cut right through the wind, so I know it's got the volume when it counts. Tiny bit of a learning curve on the breath control, but for the weight, it's a no-brainer.

Clipped it to my hiking pack's shoulder strap and honestly forgot it was there until I needed it. The titanium body feels incredibly solid for something this light, and the sound cuts right through wind noise on the trail.

Weighs next to nothing, so I forget it's even clipped to my pack until I need it. The titanium build feels solid enough to survive being tossed around in my gear bag for years. It's loud and piercing when I blow it, which is exactly what you want in a pinch.