What exactly does overstuff achieve in quilts? Say, for example, a quilt is cut with baffles for 2.5" of loft. This is then stuffed with a theoretical ideal amount of down to achieve said loft, which might provide a 20* rating. Adding overstuff may add a little more loft only to a point, because of how the baffles are cut. Is the intention of overstuff to increase loft within a fixed amount of baffle? Or is it simply help maintain loft (minimize compression) from stuffing / un-stuffing and general use? If you wanted a warmer bag, would you be better off getting a bag with bigger baffles/more loft, or adding 3 oz of overstuff to smaller baffles (ie; a warmer rated bag), which perhaps might result in the same amount of actual down? At some point, you surely pass a point of diminishing return and may even loose warmth if enough air space is pushed out by feathers.
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