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A container (often a Nalgene) into which cold and tired conservation crew members pee to avoid leaving their tents at night. Danger bags can also be used but are far more dangerous and embarrassing.
"Bad news, guys. The danger bottle wrecked my sleeping bag last night. Sorry if I smell like piss -- you're going to have to deal with it for the next seven days."

In the event of a nocturnal pee emergency, a danger bottle is highly preferable to your helmet.
by dontspillthedangerbottle2 January 23, 2011
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