How is down-fill calculated in sleeping bags?
All-knowing gear guru, I need you to confirm or dismiss a rumor I've heard about how down-fill is determined. The claim is that gear manufacturers have rooms fitted with high-powered fans and markers at 600 feet, 800 feet, and 900 feet. These rooms are then filled with down, with the down-fill getting calculated by how close to each marker the material gets blown. OK, sounds a little unscientific and downright mythical, so I come to you for the truth. Alex Hayward, California