Yes, that's the thing about DCF... any method that involves scrunching it up it still results in gobs of volume, and all those little 'micro-wrinkles' resist compression. I find that with the folding and rolling technique it takes up only slightly more space than silpoly.
One advantage of DCF over silpoly is that it folds and rolls up easily, whereas silpoly is rather like dealing with a greased pig. Not a deal breaker but it does require a little more finesse.
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