People are doing some really innovative things with these. For example, you can squeeze the down into one side, sew off, and remove the part you just flattened. This makes it smaller but improves the loft. You can remove some of the seams, also to improve the loft. Then of course, there's the old trick of running it through the dryer on the fluff cycle with tennis balls.
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The journey is more important than the destination.