It’s one of those things that every backpacker ends up discovering on their own at some point–if you put a headlamp or two underneath your Nalgene bottle, it diffuses the light and gives a nice soft glow to huddle around in lieu of a fire. The Firefly from Guyotdesigns takes the next logical step and actually integrates the light into the cap. They just sell the cap, so, like a high school party out at the abandoned quarry, it’s BYO bottle.
Plus, it’s called Firefly, so you know it’s good.
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