Carrying a tube is smart anyway, even if you're not in Arizona. For exemple if you're in an extreme cold weather environment, wearing a tunnel hood with fur trim and trying to get a fire going, the tube come in handy to blow on it and keep the hood material away from the heat. It's also convenient when you want to drink dirrectly from a home made Yucan type of stove when melting snow. In fact, the wise and knowledgeable survivor always carries about 3 foot of flexible tubing in his pocket.