Using Nalgene Bottle As A Sleeping Bag Heater

What could possibly go wrong using a bottle of boiling water as a heater in your sleeping bag? Well, apparently they can explode or crack and leak....if you don't do this....
Of course, after following these directions you would still place the bottle in an airtight ziplock as added security. A more robust option is to use a good quality dry bag with the top correctly rolled and sealed.
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[@Tortomus]

Thank you for the video this is exactly what I was looking for regarding the pressure. Other sources recommended leaving a gap but this seems like it makes more sense

[@WPG101]

Probably the most important thing is to relieve the pressure after about 30 seconds to a minute. That should do the trick.