Believe it or not, I considered the same thing, some sort of snorkel. I considered a cardboard tube from paper towels. But, with a tiny breathing hole, I never actually had any condensation problems. To my great surprise, a couple of hours near dawn on a 10F morning, even completely closed I had no noticeable problems. (but boy did I warm up noticeably when I closed it all the way! ) I suppose that the Velcro closure was far enough from being a good seal that my breath could escape, even fully closed.
In that picture where I am on my side (not sure if you can tell that I am on my side), I would just rotate that pod so that my breathing hole was also to the side, I'd get it very close to my face, and my breath would just blow outside and condense into snow and fall to the ground. I had a LOT of insulation around(and uncompressed insulation) my head when doing this, and I'm convinced that contributed greatly to my warmth.
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