Although I can understand not wanting to get out of a warm bag on a cold-rainy-snowy night, man up for your fellow shelter users and don't use a pee bottle. Hiked with a great guy that had the misfortune of being on the bottom tier of a two tier shelter and getting a yellow shower from a tipped over pee bottle. One of the few people that could deal with this without becoming totally unglued, bless him for his kind and forgiving nature. Guiseppe