In many cases it probably works just fine. It'll make a mess of your pots, of course. And if it's raining, maybe you'll have a problem, although even wet wood is usually only wet on the surface. I also wonder how often you'd have to stick that tube in your mouth and blow on it. Keep in mind as well that in some areas it's strictly forbidden to burn wood. But what the heck. It's probably kind of fun to use, and after all didn't everyone cook over a fire once upon a time? And for a long backpacking trip through terrain where fuel is plentiful, it might save you four or five pounds over a regular backpacking stove and the fuel-the fuel being the big weight contributor.
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