Am deciding between the Blue Kazoo and the Cats meow. Have read the specs, which say the two bags are close in weight and compressed size. I know down will be be more suseptible to moisture than the synthetic and there is a temp rating difference, but can anyone compare the two from experience? Specifically, in terms of compressibllity - TNF says both compress to the same size but does the Kazoo, because it is down, compress to an even smaller size? One Kazoo review claims the Kazoo compresses to the size of a nalgene. Can I really get the Kazoo down that far and will the CM also go that far?